CN1393323A

CN1393323A - portable tool machine

Info

Publication number: CN1393323A
Application number: CN02124787A
Authority: CN
Inventors: K·弗劳哈黙; M·赫尔巴赫; H·施尼林
Original assignee: Robert Bosch GmbH
Current assignee: Robert Bosch GmbH
Priority date: 2001-06-25
Filing date: 2002-06-25
Publication date: 2003-01-29
Anticipated expiration: 2022-06-25
Also published as: CH695852A5; GB2378488A; GB2378488B; CN1283423C; DE10130520B4; DE10130520A1; JP2003062768A; GB0214311D0

Abstract

The invention achieves better use of a machine tool when mounting various types of drills or drill crowns. A safety clutch 14 provided to a drive system contains two clutch elements for transmission of torque centering around a rotating axial line. The clutch elements are coupled through the medium of an engaging mechanism equipped with an engaging element 22. When the engaging element exceeds limit torque to release an engaging state, the limit torque can be adjusted to various values by using one or more operation means 36.

Description

Hand held power machine

Technical field

The present invention relates to a kind of hand held power machine.

Technical background

Still continue rotation uncontrollably for fear of the percussion drill that when stuck within the walls, grips when the circular drill bit of drill bit or insert by the user, known, the circular drill bit of drill bit or insert is connected with the drive unit of percussion drill by a safety clutch, in case drill bit is stuck, safety clutch is just thrown off immediately.

Hand held power machine by the band safety clutch of known a kind of this type of DE 3832202 C1.For transmit the moment of torsion safety clutch have one first radially internal clutch spare and surround the second clutch spare of first clutch spare, clutch device interconnects by the latch elements of making roller.Roller moves in gathering sill in first clutch spare.Be provided with a compression spring in gathering sill, it is bearing on the bottom land in its first end, and with its second end radially outward towards second clutch spare directive effect on roller, roller is pressed in the breach of second clutch spare.If surpass the moment of torsion of regulation, this post radially inwardly skids off from breach, presses to compression spring, and throws off safety clutch.Then roller skids off breach.

Summary of the invention

The present invention relates to a kind of hand held power machine that at least one is installed in the safety clutch in driving-chain in the housing that has, in order to transmit moment of torsion around rotating shaft, this safety clutch has at least two clutch elements, clutch element interconnects by the locking mechanism that has at least one latch elements, and locking mechanism is thrown off when surpassing a ultimate torque.

The present invention's suggestion, ultimate torque can be adjusted to different numerical value by means of at least one adjusting device.Though ultimate torque is less than the peak torque of obtaining by ergonomics in according to the hand held power machine of prior art, but adjust to greater than the maximum working torque that may occur, above in contrast to this scheme has such advantage, when promptly using hand held power machine with less possible operation torque, for example with the unit-type drill head that is no more than the 40mm diameter, ultimate torque then can be adjusted smallerly.Possible maximum working torque appears at when particularly piercing concrete with the circular drill bit of big insert.

Using when comparing less operation torque work with maximum working torque, under stuck situation, can avoid operator, material or locking mechanism to bear unnecessary high load capacity, and by avoiding unnecessary high reaction torque to improve security.Can reduce the particularly wearing and tearing in locking mechanism, and be issued to long service life in the situation that ultimate torque remains unchanged at least substantially.

Ultimate torque can by with different, do to such an extent that can adjust in professional's rational structure, for example use a kind of adjustable detent profile or the like.If but ultimate torque can adjust by a kind of pretightning force of locking mechanism that can be by the adjusting device adjustment, just can realize the simple especially solution of a kind of structure.Pretightning force can have been made level or step-less adjustment.

The pretightning force of latch elements produces by at least one compression spring in a kind of preferred structure of the present invention.It can make normal structure easily, and can reach little construction expenditure.

Compression spring its dorsad an end of latch elements preferably be bearing on the spring spindle, it can move by the outline of adjusting device.Spring spindle provide can with the advantage of the binding face of the outline optimum Match of adjusting device.Therefore compression spring can be by spring spindle safety, reliable and do not have fret wear ground by the adjusting device tensioning with loosen.On an end of compression spring, can reach binding face favourable, especially flat at it, make compression spring move reliably, and can avoid stuck or buckling by spring spindle for compression spring.

Adjusting device advantageously is made of a push rod, and at least one spring spindle is bearing on its shell surface, and its diameter with the contact zone of spring spindle in change.Adjusting device is built in the locking mechanism with can saving the position, and particularly arranges perpendicular to spring spindle.Can advantageously a plurality of spring spindles be set around adjusting device or push rod star, and by the adjusting device adjustment.

The present invention is suggestion secondly, and compression spring and spring spindle are contained in the hole of clutch element, reach favourable guiding thus, and can avoid the crooked and stuck of locking mechanism reliably.

The best pretension of adjusting device also can move by this cam on a cam, can be transformed into moving axially of adjusting device easily with rotatablely moving thus, and reach favourable gearratio.

Advise that in another kind of structure of the present invention cam can rotate by an external rotating bar that is contained on the machine hand tool housing.Can reach the easy operation of adjusting device with few construction expenditure.In order adjusting device to be fixed on the position of each hope, dwang can be done to such an extent that can snap in the different positions.

Can be rotated to support in the sealing thread spare that is screwed in the machine hand tool housing in a kind of preferred form of implementation cam.The possibility that this paper provides an a kind of revoling tube to carry out sealing simple in structure with respect to machine hand tool housing inside particularly can reach the pretension that adjusting device is pressed in the spring on the cam easily when sealing thread spare is installed.

Secondly suggestion, adjusting device can be handled by an actuator that is contained in the housing, can improve comfortableness thus.Actuator can be made pneumatic, electronic and/or electromagnetism, for example is made of a motor or an electrically-energized reciprocating motion electromagnet.

Actuator is according at least one operational factor control in a kind of preferred form of implementation.Can avoid operating mistake reliably, and can further improve comfortableness.

Especially operational factor is derived out by a method of operation of selecting, and that is to say, makes locking mechanism adjust to best pretightning force according to the difference of the method for operation of adjusting by actuator.But also can, measure operational factor by sensor.For example, that is to say, can reach especially flexibly with sensor and adjust according to the automatically best ultimate torque of adjusting of the difference of used bit diameter according to the difference of drill chuck position.

Description of drawings

Other advantages are obtained by following the description of the drawings.One embodiment of the present of invention have been represented in the drawings.Accompanying drawing, explanation and claims comprise many combination of features.The mode that the professional also can suit is considered these features separately and is merged into significant other combinations.

Accompanying drawing is as follows:

Fig. 1 is by a cross section of percussion drill that has a fastener on-off device of the locking mechanism with powerful pretension in driving-chain;

Fig. 2 is by a cross section of percussion drill of locking mechanism by having of Fig. 1 of weak pretension;

Fig. 3 is along the section of III-III line among Fig. 1;

Fig. 4 is along the section of IV-IV line among Fig. 2.

The specific embodiment

Fig. 1 represent by one do not draw in detail have a section that is installed in the percussion drill of the safety clutch of making the fastener on-off device 14 in the housing 44 inherent driving-chains.Safety clutch 14 has a clutch spur gear 16 and the clutch disk 20 that two clutch elements, have kayser cam 18, and it interconnects by locking mechanism and the latch elements 22 of making roller.Clutch spur gear 16 can be rotated to support on percussion drill one bevel gearing pinion 10 the shaft shoulder 24 and press fit between the clutch disk 20 of axle on 26.The pinion 10 of bevel gearing is shaped on axle 26, bevel gear 12 engagements of pinion and bevel gearing.

Clutch disk 20 has at least two grooves 28 respect to one another, is separately installed with a roller 22, a compression spring 30 and a spring spindle 32 in the groove, and wherein roller 22 and spring spindle 32 move in groove 28.The compression spring 30 of pretension radially outward is pressed in roller 22 on the kayser cam 18, simultaneously spring spindle 32 radially inwardly is pressed in one and makes on the adjusting device 36 of push rod.

Roller partly stretches out groove 28, and is bearing on the precipitous edge 34 of kayser cam 18 (Fig. 3 and 4) at circumferencial direction when not overstepping the extreme limit moment of torsion.If overstep the extreme limit moment of torsion, be pressed in the groove 28 just roller overcomes the effect of compression spring 30, so the precipitous edge 34 of kayser cam 18 can leave roller.With respect to clutch disk 20 rotations, throw off by safety clutch 14 together with its kayser cam 18 for clutch spur gear 16.

The ultimate torque of opening safety clutch 14 depends on the locking mechanism pretightning force of compression spring 30 in other words.Spring force is determined by the decrement of compression spring 30, that is is had the position of the spring spindle 32 of compression spring 30 to determine by its upper support when roller snaps in.

The adjusting device 36 of making push rod is installed in the axle 26 of making hollow shaft, and is installed in axle 26 by one and is pressed on the cam 40 along the direction of pinion 10 dorsad towards the spring 38 of pinion 10 1 sides.Cam 40 is screwed on the sealing thread spare 42 of housing 44 one at a side bearing of push rod dorsad, can be rotated to support in the through hole of sealing thread spare 42 with a cylindrical part 52, and extend beyond sealing thread spare 42 and housing 44 with processing outer-hexagonal 54 thereon.For the sealing of the through hole in the sealing thread spare 42, the O shape of packing in the cannelure in the cylindrical part 52 of cam 40 circle 58.Sealing thread spare 42 passes through cam 40 and push rod preloading spring 38 when being screwed into.

On the outer-hexagonal 54 of hull outside cam 40, install one have one corresponding in the dwang 46 of hexagonal.The rotation of dwang 46 or cam 40 causes a lift 48 of push rod.Push rod towards a side of pinion 10 with the contact zone of spring spindle 32 in have the diminishing subregion 56 of pinion 10 directions on one day.

If pass through the cam 40 edges direction adjustment push rod of pinion 10 dorsad, spring spindle 32 radially moves inward so.Thereby reduce the pretightning force and the ultimate torque (Fig. 2 and 4) of compression spring 30.Percussion drill is adjusted to and is suitable for using the unit-type drill head that is not more than 40mm.

If make push rod to pinion 10 direction adjustment by cam 40, spring spindle 32 radially outward moves so.Thereby the pretightning force of intensified pressure spring 30 and ultimate torque (Fig. 1 and 3).Percussion drill is adjusted to and is suitable for adopting the circular drill bit of insert.

Housing 44 parts of percussion drill are filled oil, and oil arrives axle 26 by the lubricant hole in the pinion 10 50, and enters safety clutch 14.

Pictorial symbolization

10 pinions, 28 grooves

12 bevel gears, 30 compression springs

14 safety clutch, 32 spring spindles

16 clutch spur gears, 34 edges

18 kayser cams, 36 adjusting devices

20 clutch disks, 38 springs

22 latch elements, 40 cams

24 shaft shoulders, 42 sealing thread spares

26 44 housings

46 dwangs, 54 outer-hexagonals

48 lifts, 56 subregions

50 lubricant holes, 58 O shapes circle

52 cylindrical parts

Claims

1. hand held power machine, it has at least one and is installed in the interior safety clutch in driving-chain (14) of a housing (44), this transmission has at least two clutch elements around the safety clutch of the moment of torsion of rotating shaft, they interconnect by the locking mechanism that has at least one latch elements (22), locking mechanism is thrown off when overstepping the extreme limit moment of torsion, and it is characterized in that: ultimate torque can be adjusted to different numerical value by means of at least one adjusting device (36).

2. according to the described hand held power machine of claim 1, it is characterized in that: ultimate torque can be by the pretightning force adjustment that can pass through the locking mechanism that adjusting device (36) adjusts.

3. according to the described hand held power machine of claim 2, it is characterized in that: the pretightning force of locking mechanism produces by at least one compression spring (30).

4. according to the described hand held power machine of claim 3, it is characterized in that: a side bearing of latch elements (22) is on a spring spindle (32) dorsad at it for compression spring (30), and spring spindle can move by the outline of adjusting device (36).

5. according to the described hand held power machine of claim 4, it is characterized in that: adjusting device (36) is made of a push rod, supports a spring spindle (32) on its shell surface at least, and with the contact zone of spring spindle (32) in its diameter change.

6. according to claim 4 or 5 described hand held power machines, it is characterized in that: compression spring (30) and spring spindle (32) are placed in the hole (28) of clutch element.

7. according to each described hand held power machine of aforesaid right requirement, it is characterized in that: adjusting device (36) is pressed on the cam (40), and can move by this cam.

8. according to the described hand held power machine of claim 7, it is characterized in that: cam (40) can rotate by a dwang (46) that is installed in housing (44) outside.

9. according to the described hand held power machine of claim 8, it is characterized in that: cam (40) can be rotated to support in the sealing thread spare (42) that can be screwed in the housing (44).

10. according to each described hand held power machine of claim 1 to 7, it is characterized in that: adjusting device (36) can be handled by an actuator that is installed in the housing (44).

11. according to the described hand held power machine of claim 10, it is characterized in that: actuator is according at least one operational factor control.

12. according to the described hand held power machine of claim 11, it is characterized in that: operational factor is derived out by the method for operation of selecting.

13. according to the described hand held power machine of claim 11, it is characterized in that: operational factor is measured by sensor.