DE102008036395A1 - Controller i.e. electric switch, for e.g. boring machine, has cooling body with region that is arranged in housing such that heat-producing component and parts of circuit arrangement stay in direct heat conducting connection with region - Google Patents

Abstract

The controller i.e. electric switch (1), has a heat-producing component e.g. power transistor, and parts of a circuit arrangement staying in effective heat conducting connection with a cooling body (6) provided on an outer side of housing (2). The cooling body exhibits two regions, where one of the regions is arranged in the housing such that a heat-producing component and parts of the circuit arrangement stay in direct heat conducting connection with the region. Another region (12) protrudes from the housing in a two-sided lateral outlet.

Description

The The invention relates to a control device according to the preamble of claim 1

such Control devices are mainly used as electrical switches for an electric hand tool with an electric motor, like for a cordless and / or mains power tool, use. These power tools may be drills, grinders, Saws, planers, angle grinders or the like act.

From the DE 195 08 925 A1 an electrical switch for a power tool is known, which has a housing for receiving an electrical circuit arrangement for controlling and / or regulating the electric motor. Such a circuit arrangement may be an electronic component for the control and / or regulation of the rotational speed of the electric motor, for example by pulse width modulation. Further applications for such an electronic component, the control and / or regulation of the freewheel, for example by diodes, the torque, for example by current control, or other characteristics such as automatic shutdown, automatic control, electronic braking, electronic soft start of the electric motor o. The like., be. The circuit located in the housing now again contains at least one component, such as a power semiconductor, a power transistor, a MOS-FET, a triac o. The like., Which serves for the corresponding control and / or regulation of the current flowing through the component to the electric motor electrical load current.

The Component generates a due to its function as a power component Power loss in the form of heat coming out of the case is payable. Likewise, other parts of the Circuit arrangement generate heat loss. To the exhaustion This heat is a befindlicher on the outside of the housing Heat sink with which the heat-generating Component and / or at least parts of the circuit arrangement in heat-conducting Connection stand. It has now been found that in In some cases, especially in Dauerlast- and / or blocking case of the power tool in previous heat sinks the heat dissipation is not sufficient. It lies on the hand, that in such cases the reliability the switch and thus the power tool suffers.

Of the Invention is based on the object, the heat sink to develop such that the discharge of the Heat from the housing is improved. Especially should be an effective cooling of the power semiconductor in the Dauerlast- and / or blocking case taking advantage of the device existing cooling air flow and / or attention to the restricted space in the handle and / or considering the simple Kontaktiermöglichkeit between switch and motor given be.

These Task is in a generic control unit solved by the characterizing features of claim 1.

at has the control device according to the invention the heat sink at least two areas. Of the first region of the heat sink is arranged in the housing, such that the heat-generating component and / or at least parts of the circuit arrangement in direct connection with the first area, ie at the first area in thermally conductive connection are attached. The second area of the heat sink protrudes out of the housing, especially in the manner of a on both sides lateral exit from the housing. Further Embodiments of the invention are the subject of the dependent claims.

In usual Way is in a power tool the switch in the power tool housing, and preferably arranged in the handle. To one further improvement of heat dissipation is sufficient the second area of the heat sink into the Range of cooling air flow for the power tool, which mainly serves to cool the electric motor into it. Contrary to previous embodiments, the second area is thus continued until the cooling air flow.

Of the Heat sink can be dissipated heat be adapted accordingly. This is the heat sink stepped in terms of its thickness configured. The first area of the heat sink is mainly in the range of power semiconductors and / or the power component with a higher material thickness provided so as to further improve the heat dissipation.

One Part of the projecting into the cooling air flow second area of the heat sink can be designed like a wing be. Above all, the wing-like second area protrudes into the cooling air flow for the power tool. Furthermore, the wing-like second region of the heat sink with slots, openings, openings o. to increase the surface and / or Facilitate the airflow for the passage of air be. Such an embodiment is in a special way the space adapted in the power tool and optimizes the heat dissipation.

The mounting of the heat sink in the housing can be accomplished in a simple manner that the second region is angled at the exit from the housing with respect to the first region. It is advisable that the bend in about 90 ° is. The second area expediently bears against the wall of the housing. A simple mounting of the heat sink is given when the heat sink is attached, for example by means of latching and / or snap connections for the second area on the housing.

In usual Way, the case can be a socket as well as a lid include. Conveniently, the heat sink attached to the base. For ease of installation, the lid can be secured by means of latching and / or snap connections on the base, wherein then the second region of the heat sink a recess for the locking and / or Schanppverbindung has between the lid and base.

In Adaptation to the flow direction of the cooling air flow The wing-like second area can be angled from the rest second area be configured projecting. Preferably the angle between these areas between 90 ° and 160 °, in particular in about 120 °. To be optimally located in the cooling air flow to be dominated by the second wing-like area the housing. A further optimization of heat dissipation can be achieved by that, too the wing-like second area at least partially with a higher material thickness is provided.

For a cost manufacturability is the heat sink largely integrally formed. It is suitable on, the heat sink in the manner of a stamped and bent part to produce from a milled and / or rolled sheet metal strip. Furthermore, the range of higher material thickness on the heat sink by plating, welding, Auflötung o. The like. Be prepared. As material for The heat sink is well thermally conductive Materials such as copper, aluminum, steel o. The like.

In summary can be for a particularly preferred Design determine that the charcoal body graded with a higher material thickness in the range the power semiconductor is configured. The arrangement of the heat sink in the switch takes place with a discharge on both sides the switch housing and a continuation of the heat sink into the range of the device cooling air flow. optional may be the sequel with slots for air passage to increase the surface and / or Facilitate the airflow.

The particular advantages of the invention are that by the thickening of the heat sink in the area of the power semiconductor in case of blocking more heat recorded and subtracted from the power semiconductor. by virtue of the larger cross-section can also in the permanent load case significantly more heat dissipated and in the area be passed on the cooling air flow. This can a lower specified and much cheaper power semiconductor be used. This also results in a cost savings. In addition, the improved discharge of the Loss heat the reliability of the controller and / or the switch improved.

One Embodiment of the invention with various developments and embodiments is shown in the drawings and will described in more detail below. Show it

1 an electrical switch in perspective overall view,

2 the heat sink of the switch 1 as an individual part in perspective view,

3 the contact system of the switch 1 .

4 the embodiment of the deflection of the actuating movement for the switch and

5 a Einschaltsperreinrichtung for the actuator of the switch.

In 1 is an electrical switch 1 shown, which is suitable for use for an electric hand tool with an electric motor, such as for a cordless and / or power tool. The electric tools can be, for example, bolt machines, grinders, saws, planers, angle grinders or the like. In particular, the switch 1 suitable for use in the handle of a two-hand angle grinder. The desk 1 has a housing 2 for receiving a movable switching contact 8th as well as a fixed contact 9 comprehensive contact system 7 (please refer 3 ). At the housing 2 is a manually by the user by pivoting movable actuator 3 arranged. The actuator 3 acts on its operation on the switching contact 8th for switching the contact system 7 a, so that the power tool by means of the actuator 3 switched on and / or off. At the housing 2 are still electrical connections 4 to connect the switch 1 with a power source and electrical connections 5 to connect the switch 1 with the electric motor.

Finally, it is in the case 2 an electrical circuit arrangement for controlling and / or regulating the electric motor. The circuit arrangement serves as control electronics for speed variation of the electric motor. For this purpose, the circuit arrangement has at least one associated, heat-generating power component 10 (please refer 2 ), such as a power semiconductor, a power transistor, a MOS-FET, a triac, or the like, on, whereby a corresponding control and / or regulation of the flowing through the power component 10 to the electric motor electrical load current is carried out.

To the resulting during operation of the power tool heat loss from the housing 2 remove the heat-generating power component 10 and / or at least parts of the circuit arrangement with one at least partially on the outside of the housing 2 located heat sink 6 in thermally conductive connection. How closer 2 indicates the heat sink 6 at least two areas 11 . 12 on, which are arranged approximately in the shape of a U's. The first area 11 of the heat sink 6 is so in the case 2 arranged that the heat-generating component 10 and / or at least parts of the circuit arrangement at the first area 11 are attached in heat-conducting connection and thus in direct communication with the first area 11 stand. The second area 12 of the heat sink 6 protrudes from the case 2 in the manner of a two-sided lateral exit from the housing 2 out, how to use the 1 recognizes.

As already mentioned, the switch 1 in the handle of the power tool, which has a power tool housing arranged. The second area 12 of the heat sink 6 extends into the area of the cooling air flow for the power tool, which is used for cooling the electric motor into it. Because of this sequel 12 ' of the second area 12 Thus, the cooling air flow also serves to cool the switch at the same time 1 , How farther 2 it can be seen, is the heat sink 6 stepped in terms of its thickness configured. So that's the first area 11 of the heat sink 6 in the area of the power component 10 provided with a higher material thickness d1. The material thickness d2 in the second area 12 . 12 ' is correspondingly lower. This results in improved heat dissipation, especially in the critical area of the power component 10 , where a large heat loss arises, achieved. Part of the second area 12 ' of the heat sink 6 is designed like a wing, so that this protrudes in a better and adapted manner in the cooling air flow for the power tool. As based on 1 recognizable is the wing-like second area 12 ' at the front of the heat sink 6 arranged. In addition, other parts of the second area 12 '' be wing-like, with these other wings 12 '' at the front top of the heat sink 6 are located. As a result, the utilization of the cooling air flow for heat dissipation can be further optimized. The second area 12 ' of the heat sink 6 is with slots 13 , Breakthroughs, openings o. The like. To increase the surface and / or facilitate the air flow for the passage of air provided. In other words, it is a stepped heat sink 6 in the area of the triac 10 is thickened and vents 13 on the front wings 12 ' has.

How to get by 2 sees, is the second area 12 in relation to the first area 11 on an edge 32 angled. This bend 32 is in accordance with 1 at the outlet of the heat sink 6 out of the case 2 , The angulation 32 is about 90 °, so that the second area 12 then on the respective wall of the housing 2 is applied. How further the 1 it can be seen, is the heat sink 6 by means of latching and / or snap connections 33 for the second area 12 on the housing 2 attached.

The housing 2 for the switch 1 includes a pedestal 34 as well as a lid 35 , The heat sink 6 is medium of snap and / or snap connections 33 at the base 34 attached. Next is the lid 35 by means of latching and / or snap connections 36 at the base 34 attached. The second area 12 of the heat sink 6 has a recess 54 for receiving the latching and / or snap connection 36 between lids 35 and socket 34 on.

As already mentioned, the wings protrude 12 ' . 12 '' in an adapted manner according to the conditions in the power tool housing in the cooling air flow into it. This is according to 1 the wing-like second area 12 ' . 12 '' angled from the remaining second area 12 projecting configured. The angle between the areas 12 . 12 ' and / or the areas 12 . 12 '' is between 90 ° and 170 °. In a two-hand angle sander switch, an angle of about 120 ° has proven to be particularly optimal. It is particularly favorable for the heat dissipation even if the second wing-like area 12 ' . 12 '' the housing 2 surmounted. A further optimization of the heat dissipation can finally be achieved by the wing-like second area 12 ' is at least partially provided with a higher material thickness d3, as in 2 you can see.

The heat sink 6 is according to 2 designed largely in one piece. Such a heat sink 6 can be made of a milled or rolled sheet metal strip made of copper, aluminum, steel o. The like. In the manner of a stamped and bent part. The areas with higher material thickness d1, d3 on the heat sink 6 can be prepared by plating, welding, soldering o. The like. Of the other material.

The contact system 7 for the switch 1 is closer in 3 to see. The actuator 3 acts with an actuator 17 for switching the contact system 7 together, as explained in more detail below. The means of the actuator 17 about an approach 18 movable switching contact 8th is at a contact camp 14 pivoted. The contact camp 14 is as a springy Bearing configured such that the contact force of the spring force of the contact bearing 14 itself is generated. Thus, the usual, with the switching contact 8th interacting compression spring or leaf spring can be eliminated. To generate the spring force, the contact bearing 14 an approximately U-shaped configured section 15 on.

In the case 2 there is a circuit board 16 , which serves to receive electrical and / or electronic components for the control and / or regulating electronics for the power tool. The U-shaped section 15 is approximately parallel to the circuit board 16 arranged and the contact bearing 14 is with its U-shaped section 15 directly on the circuit board 16 soldered. This is the one leg 37 of the U-shaped section 15 by means of at least one protruding plug foot 39 on the circuit board 16 plugged. The thigh 37 is then on the plug-in foot 39 with the circuit board 16 soldered.

Another thigh 38 of the U-shaped section 15 , the one leg 37 opposite, has one approximately perpendicular to the other leg 38 protruding storage area 40 on. The storage area 40 closes at the end of the other thigh 38 of the U-shaped section 15 and consists of an approximately 180 ° folded portion of the other leg 38 , The switching contact 8th is as a swivel rocker with two lever arms 41 . 42 designed. The switching contact 8th has a bulge 43 between the lever arms 41 . 42 for pivoting the rocker on the storage area 40 , The actuator 3 then acts via the actuator 17 by means of the approach 18 on the two lever arms 41 . 42 for pivoting the switch contact 8th one. In this case continues to act the actuator 3 over a sliding surface 19 on the actuator song 17 such with the switching contact 8th together, that a sliding movement for the switching contact 8th transverse to the opening and / or closing movement when switching the contact system 7 is produced. Due to this sliding movement is a kind of forced tear for the switching contact 8th feasible, thus welding the contacts 8th . 9 to meet. In summary, it should be noted that a contact system 7 with springing bearing 14 is created, wherein the resilient bearing 14 the force to open and / or close the contacts 8th . 9 generated, and wherein a forced tear takes place via the sliding movement.

Finally, a busbar 44 from the one leg 37 of the U-shaped section 15 arranged outgoing, as an electrical connection to that from the housing 2 projecting electrical connection 5 (please refer 1 ), to a solder joint not shown further on the circuit board 16 o. The like. Serves. The busbar 44 is approximately perpendicular to the one leg 37 of the U-shaped section 15 from. Conveniently, the busbar 44 and / or the U-shaped section 15 and / or the storage area 40 and / or the plug-in foot 39 designed in one piece in the manner of a stamped and bent part. The thus designed in the manner of a multi-functional contact bearing 14 may consist of copper, copper beryllium o. The like.

In 4 is closer to the embodiment of the switching action of the actuator 3 on the contact system 7 to see. For this purpose, the actuator acts 3 during its operation by the user first on a direction arrow 30 essentially vertically movable plunger 20 one. The pestle 20 is medium of a joint 21 to one according to directional arrow 31 essentially horizontally movable slide 22 hinged. On the slide 22 is the actuator 17 , and to whose the plunger 20 opposite side, so that the slider 22 on the contact system 7 acts to switch by the movement of the actuator 3 approximately in the transverse direction for acting on the contact system 7 is diverted.

On the slide 22 is a spring 23 arranged in the manner of a horizontal compression spring. This is a negative force-displacement curve when switching on the contact system 7 produced. This means that a high initial force and a low stop-end force on the plunger 20 or on the actuator 3 is present. The feather 23 is in a chamber-like receptacle 45 on the slide 22 located and is at the contact system 7 associated side of the chamber 45 by means of a fixed stop 46 recorded. This then becomes the slider 22 upon actuation of the actuator 3 against the force of the spring 23 emotional. The joint 21 between the plunger 20 and the slider 22 is as a fork 47 with a stalk 48 designed. The fork 47 is by means of pins 49 rotatable on the plunger 20 stored and the stalk 48 is by means of a pin 50 rotatable on the slide 22 stored.

The movable joint 21 between the plunger 20 and the slider 22 is made in a simple manner by assembly spraying essentially in one operation. For this purpose, there is the joint 21 , in particular the pins 49 . 50 of the joint 21 , made of a first plastic as well as the pestle 20 and / or the slider 22 from a second plastic, wherein the two plastics do not connect with each other. For assembly spraying, then, the two plastics, which do not join one another, are introduced into the injection mold for the joint 21 as well as for the pestle 20 and / or the slider 22 injected simultaneously or sequentially.

The deflection of the actuating movement from a vertical to a horizontal movement contributes together with the horizontal compression spring 23 for generating the high initial force and low holding force. It also makes this a slim switch 1 created, which is particularly suitable for use in the handle of a two-hand angle grinder.

Again 1 can be taken, is the switch 1 with a switch-lock device 24 for the actuator 3 equipped. The Einschaltsperreinrichtung 24 in closer detail in 5 can be seen, includes a casserole 25 on the housing 2 and a locking member 26 on the actuator 3 , The Einschaltsperreinrichtung 24 acts such that the actuator 3 in approximately transverse to the direction of actuation according to the arrow 27 to overcome the Einschaltsperreinrichtung 24 , and in particular of the casserole 25 , ie in the direction of the arrow 28 is displaceable.

This is the actuator 3 at one end 52 (please refer 1 ) pivotable and displaceable on the housing 2 arranged. For interaction with the Einschaltsperreinrichtung 24 engages over the actuator 3 in the manner of a hollow cap on the other end 53 the Einschaltsperreinrichtung 24 how very good in 5 can be seen. In addition, the locking member 26 in the actuated position of the actuator 3 in a corresponding lock 29 , which also at the Einschaltsperreinrichtung 24 is arranged, are introduced, whereby the actuator 3 for continuous operation of the power tool in the lock 29 is held.

The locking member 26 consists of a plastic bridge, which replaces the previously used metal bolt and easier assembly is achieved. The plastic bridge 26 consists of the same plastic as the actuator 3 and is on the actuator 3 molded, and that is the plastic bridge 26 on both sides on the inner walls 51 the hollow actuator 3 molded. This is the Sperrkulisse for the lockout 24 and the lock 29 adapted accordingly.

The Invention is not on the described and illustrated embodiment limited. Rather, it also includes all experts Further developments within the scope of the claims defined invention. Thus, the invention is not limited to power tool switches can be used, but can also be at other switches, for example such for household electrical appliances, electric gardening equipment, Machine tools o. The like., Use find. Likewise the invention also to control devices with or without Housing, for example for power electronics of the power tool, for motor vehicles o. The like., Use.

1

electrical switch

2

casing

3

actuator (from counter)

4, 5

electrical Connection (at the counter)

6

heatsink

7

Contact system

8th

Switching contact / contact

9

Hard Contact / Contact

10

Power device / component / triac

11

(First) Area (of the heat sink)

12

(Second) Area (of the heat sink)

12 '

Continued / second Section / wing

12 ''

second Area / (further) wings

13

(Ventilation) slot

14

Contact Camp / resilient camp

15

U-shaped Section (from contact camp)

16

circuit board

17

actuator

18

approach (to actuator)

19

sliding surface

20

tappet

21

joint

22

pusher

23

(Pressure) spring

24

Einschaltsperreinrichtung / lockout

25

casserole link

26

Blocking member / plastic web

27 28

arrow

29

lock

30 31

arrow

32

Edge / angling

33

latching and / or snap connection (for heat sink)

34

base (of housing)

35

cover (of housing)

36

latching and / or snap connection (for cover)

37

leg (from U-shaped section)

38

(Further) Thigh (from U-shaped section)

39

Steckfuß

40

storage area (from contact camp)

41 42

lever arm (of switching contact)

43

bulge

44

conductor rail

45

admission (on slide) / chamber

46

attack

47

fork (from joint)

48

stalk (from joint)

49, 50

spigot

51

inner wall (from actuator)

52

The End (from actuator)

53

(other) End (of actuator)

54

recess (in the heat sink)

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• - DE 19508925 A1 [0003]

Claims (9)

Control device, in particular electrical switch ( 1 ) for use with a power tool with an electric motor, such as a cordless and / or power tool, such as drills, grinders, saws, planer, angle grinder o. The like., With a housing ( 2 ) for receiving at least one heat-generating component ( 10 ), such as a power transistor, a MOS-FET, a triac o. The like., In particular in an electrical circuit arrangement, for example, for controlling and / or regulating the electric motor by appropriate control and / or regulation of the by the component ( 10 ) to the electric motor flowing electrical load current is arranged, wherein the heat-generating component ( 10 ) and / or at least parts of the circuit arrangement with a on the outside of the housing ( 2 ) located heat sink ( 6 ) are in heat-conducting connection, characterized in that the heat sink ( 6 ) at least two areas ( 11 . 12 ) that the first area ( 11 ) of the heat sink ( 6 ) in the housing ( 2 ) is arranged such that the heat-generating component ( 10 ) and / or at least parts of the circuit arrangement in direct heat-conducting connection with the first region ( 11 ), and that the second area ( 12 ) of the heat sink ( 6 ) out of the housing ( 2 ), in particular in the manner of a two-sided lateral exit from the housing ( 2 ) stands out. Control device according to Claim 1, characterized in that the switch ( 1 ) is arranged in a power tool with a power tool housing, in particular in the handle thereof, and that preferably the second area ( 12 ) of the heat sink ( 6 ) extends into the area of the cooling air flow for the power tool, in particular for the electric motor. Control device according to Claim 1 or 2, characterized in that the heat sink ( 6 ) is designed stepped in terms of its thickness, and that preferably the first area ( 11 ) of the heat sink ( 6 ), in particular in the area of the power component ( 10 ), provided with a higher material thickness. Control unit according to Claim 1, 2 or 3, characterized in that a part of the second area ( 12 ' . 12 '' ) of the heat sink ( 6 ) is designed like a wing, that preferably the wing-like second area ( 12 ' . 12 '' ) protrudes into the cooling air flow for the power tool, and that more preferably the wing-like second area ( 12 ' ) of the heat sink ( 6 ) with slots ( 13 ), Openings, openings o. The like. Provided for the passage of air to increase the surface and / or facilitating the air flow. Control unit according to one of Claims 1 to 4, characterized in that the second area ( 12 ) at the exit from the housing ( 2 ) in relation to the first area ( 11 ) is angled, that preferably the angulation ( 32 ) is approximately 90 °, that more preferably the second region ( 12 ) on the wall of the housing ( 2 ) is applied, and that still further preferably the heat sink ( 6 ), in particular by means of latching and / or snap connections ( 33 ) for the second area ( 12 ) on the housing ( 2 ) is attached. Control device according to one of Claims 1 to 5, characterized in that the housing ( 2 ) a socket ( 34 ) and a lid ( 35 ), that preferably the heat sink ( 6 ) on the base ( 34 ) is attached, and further preferably that the lid ( 35 ) by means of latching and / or snap connections ( 36 ) on the base ( 34 ), wherein in particular the second region ( 12 ) of the heat sink ( 6 ) a recess ( 54 ) for the latching and / or Schanppverbindung ( 36 ) between covers ( 35 ) and socket ( 34 ) having. Control device according to one of Claims 1 to 6, characterized in that the wing-like second region ( 12 ' . 12 '' ) at an angle from the remaining second area ( 12 ) protrudes that preferably the angle between the areas ( 12 . 12 ' ) and / or the areas ( 12 . 12 '' ) is between 90 ° and 170 °, in particular approximately 120 °, and that more preferably the wing-like second region ( 12 ' ) is at least partially provided with a higher material thickness. Control device according to one of Claims 1 to 7, characterized in that the heat sink ( 6 ) is largely in one piece, in particular in the manner of a stamped and bent part made of a milled and / or rolled sheet metal strip, is formed, that preferably the region of higher material thickness on the heat sink ( 6 ) by plating, welding, soldering o. The like. Is made, and that further preferably the heat sink ( 6 ) made of copper, aluminum, steel o. The like. Exists. Control device according to one of Claims 1 to 8, characterized in that the second wing-like region ( 12 ' . 12 '' ) the housing ( 2 ) surmounted.