hand-held power tool

Abstract

A hand-held power tool (100) comprising a transmission (170) in a housing (110) with several gear ratios for transmitting a torque generated by a drive motor (180) to a drive shaft (120), at least one actuating element (200) provided on the housing (110), wherein at least one first sensor (212) is provided which detects a position of the actuating element (200) and sends a signal corresponding to this position to an electronic control of the hand-held power tool (100), wherein a second sensor (214) detects the position of a second actuating element (204) and sends a signal corresponding to this position of the second to the electronic control of the hand-held power tool (100), wherein an actuating ring (220) is provided, wherein the actuating ring (220) is arranged to be displaceable in the radial direction below the first actuating element (202) and in the circumferential direction of the housing (110).wherein the adjusting ring (220) has at least one channel (230) in the circumferential direction, characterized in that at least one actuating element (130) arranged to be displaceable only in the axial direction of the hand-held power tool (100) is connected to the housing (110), wherein the actuating element (130) engages in the channel (230) of the adjusting ring (220) via at least one connecting element (132).

Description

[0001] The present invention relates to a hand-held power tool, in particular a stick screwdriver, a drill screwdriver or a cordless drill screwdriver, according to the preamble of claim 1, with a tool carrier that can be set in rotation and which can be driven by a drive motor via a gearbox.

[0002] Power tools with a gearbox, such as cordless drills or power drills, typically have a safety clutch to prevent the tool from rotating uncontrollably if a predefined torque is exceeded. It is also known that such power tools have actuating elements by which the transmitted torque can be adjusted and thus different operating modes selected. For example, US Patent 2011 / 0232933 A1 discloses a power tool with a rotating tool holder, the tool holder being driven by a drive motor via a gearbox. The known power tool has an adjustment device by which it can be switched between several operating modes.In addition to the operating mode, the rotational speed can also be adjusted depending on the position, with automatic operation at variable speed also being possible. The operating modes are set manually, and adjustments or readjustments to the various parameters during operation can only be made manually.

[0003] DE 10 2010 029 267 A1 discloses an electric tool with a drive motor which is coupled to an output element via a gearbox having several gear ratios, wherein the torque generated by the drive motor can be adjusted by means of a first, manually operable adjusting device, and with a second, manually operable adjusting device.

[0004] EP 2 650 085 A2 describes a control system for a hand-held machine tool which has an electric motor and an output spindle that can be driven by the electric motor.

[0005] From EP 2 554 306 A2, an impact wrench is known which has a connecting unit and a first and second elongated recess arranged between a mode setting ring.

[0006] EP 2 404 710 A2 describes an electric hand-held power tool which has a motor, a speed reducer and a transmission change unit.

[0007] EP 1 595 649 B1 describes a rotary impact tool with a rotating drive mechanism that includes a motor for rotating a drive shaft, a hammer that engages with the drive shaft, an output shaft onto which the driving force is applied by the impact of the hammer, a main switch that is operated by a user to control a fastening operation, and a torque setting switch that is used by a user to set a tightening torque.

[0008] US patent 2013 / 0126202A1 discloses a hand-held power tool comprising a handle, a power supply, and a motor.

[0009] The object of the invention is to improve upon the aforementioned disadvantages and to provide a hand-held power tool that enables simple, safe and flexible adjustment of the operating modes, while being as simple in design and cost-effective as possible.

[0010] This problem is solved by a hand-held power tool according to claim 1. Advantageous embodiments, variants and further developments of the invention can be found in the dependent claims.

[0011] According to the invention, a hand-held power tool comprises a gearbox, in particular a planetary gearbox, housed in a casing and having several gear ratios, for transmitting torque generated by a drive motor to a drive shaft, and at least one actuating element provided on the casing, in particular for adjusting the torque and / or a gear ratio of the gearbox, characterized in that at least one first sensor is provided which detects a position of the at least one actuating element and sends a signal corresponding to this position to an electronic control unit of the hand-held power tool. This provides a hand-held power tool that enables safe, simple, and user-friendly operation compared to the prior art.It is advantageous that the electronic control can be carried out from inside via a microcontroller included in the housing, which evaluates the transmitted signals from the sensor.

[0012] Accordingly, in a constructive implementation of the invention, it is proposed that the control system activates an operating state on the hand-held machine tool with a combination of predefined parameters depending on the corresponding signal, thereby ensuring that the hand-held machine tool always runs in an operating state adapted to the situation and thus in an optimal operating state.

[0013] In a particularly preferred embodiment of the invention, a first sensor detects the position of a first actuating element and a second sensor detects the position of a second actuating element, wherein the first sensor and the second sensor each send a corresponding signal to the electronic control of the hand-held power tool, and the control activates an operating state on the hand-held power tool with a combination of predefined parameters depending on the corresponding signals. In this way, it can be ensured that the parameters are optimally set based on the position of the actuating elements, and thus the hand-held power tool can be used in an optimal operating state, while the use of a hand-held power tool according to the invention is individual, safe, simple and, above all, user-friendly.

[0014] Preferably, the actuating element is designed in the form of a mechanically actuated switch, in particular a slide switch, a push-button switch, and / or a sensor-actuated switch. In a particularly preferred embodiment, the actuating element is a slide switch that can be displaced circumferentially within the housing. This ensures a high degree of robustness for the hand-held power tool, and especially for the actuating element.

[0015] It has proven advantageous to provide an adjusting ring, wherein the adjusting ring is arranged to be displaceable radially below the adjusting element and circumferentially around the housing. Advantageously, the adjusting ring is connected to the adjusting element via a coupling element such that movement of the adjusting element is transmitted to the adjusting ring.

[0016] In a particularly preferred embodiment, the adjusting ring has at least one channel in the circumferential direction, wherein in an advantageous embodiment the channel runs obliquely to the circumferential direction in a first section and in the circumferential direction in a second section.

[0017] According to one embodiment of the invention, at least one actuating element is connected to the gearbox housing and is arranged to be displaceable only in the axial direction of the hand-held power tool, wherein the actuating element engages in the channel of the actuating ring via at least one connecting element.

[0018] Preferably, a rotational movement of the adjusting ring in the circumferential direction causes an axial movement of the actuating element when the connecting element is located in the region of the first section, and a rotational movement of the adjusting ring in the circumferential direction causes no movement of the actuating element when the connecting element is located in the region of the second section.

[0019] In a preferred embodiment, the gearbox housing has at least one first guide means in the circumferential direction and the adjusting ring has at least one second guide means in the circumferential direction, wherein the second guide means interacts with at least the first guide means in such a way that a rotational movement of the adjusting ring in the circumferential direction causes an axial movement of the actuating element.

[0020] In a particularly advantageous embodiment, the gearbox further comprises a flange, wherein the flange includes at least a third guide means in the circumferential direction, wherein the third guide means interacts with the second and / or with the first guide means in such a way that a rotational movement of the adjusting ring in the circumferential direction causes an axial movement of the actuating element.

[0021] Advantageously, the transmission has at least one ring gear, wherein the ring gear is positively connected to the actuator in the axial direction by means of connecting elements such that an axial displacement of the actuator causes an axial movement of the ring gear. This axial movement of the ring gear engages the transmission in at least two different speed stages. It is particularly advantageous that the ring gear is positively connected to the actuator in the axial direction by means of connecting elements.

[0022] In particular, at least one spring element is provided, wherein the spring element holds the actuating element in the different positions.

[0023] Furthermore, it has proven advantageous to provide at least one optical display device, in particular a binary display, a numerical display, or an analog display, wherein in a particular embodiment of the invention the at least one display device indicates the position of the actuating element detected by the sensors and / or the operating state of the hand tool activated by the control, so that a user can quickly ascertain the operating state and, if necessary, make changes.

[0024] In a preferred embodiment, the hand-held power tool is a cordless drill / driver, a drill, a hammer drill or a rotary hammer, wherein a drill bit, a core drill or various bit attachments can be used as the tool.

[0025] The term "hand-held power tool" generally refers to all hand-held power tools with a rotating tool holder driven by a motor via a planetary gearbox, such as screwdrivers, cordless drills, impact drills, multi-tools, and / or drill drivers. In this context, "transmission of electrical energy" specifically means that the hand-held power tool transmits energy to the body via a battery and / or a power cable connection.

[0026] Further features, applications, and advantages of the invention will become apparent from the following description of the exemplary embodiment of the invention, which is illustrated in the drawing. It should be noted that the features described or illustrated in the figures, individually or in any combination, have only a descriptive character regarding the subject matter of the invention, irrespective of their grouping in the claims or their cross-references, and irrespective of their formulation or representation in the description or in the drawing, and are not intended to limit the invention in any way. Drawings

[0027] An embodiment of the invention will now be explained in more detail with reference to the embodiments shown in the drawings. The drawings show: Fig. 1 a perspective schematic partial view of a hand-held power tool according to the invention in the form of a cordless drill / driver; Fig. 2 a perspective schematic view of a first variant of an adjustment unit of a hand-held power tool according to the invention; Fig. 3 a perspective schematic view, partly an exploded view of the adjustment unit Fig. 2; Fig. 4 a perspective schematic view of a section of the adjustment unit of the Fig. 2 and Fig. 3; Fig. 5 a schematic sectional view of the adjustment unit from the Fig. 2 to 4 with connecting elements in the area of ​​a first section; Fig. 6 a schematic sectional view of the adjustment unit from the Fig. 2 to 5 with connecting elements in the area of ​​a second section; Fig. 7 a perspective schematic view of a second variant of an adjustment unit of a hand-held power tool according to the invention; Fig. 8 a perspective schematic view, partly an exploded view of the adjustment unit from Fig. 7; Fig. 9 a perspective schematic view of a section of the adjustment unit of the Fig. 7 and Fig. 8; Fig. 10 a schematic sectional view of the adjustment unit from the Fig. 7 to 9 with the actuator in a first position; Fig. 11 a schematic sectional view of the adjustment unit from the Fig. 7 to 10 with the actuator in a second position; and Fig. 12 a perspective schematic, partially cut-out view of the hand-held machine tool in the area of ​​the setting unit.

[0028] The Fig. Figure 1 shows a hand-held power tool 100 according to the invention, which has a housing 105 with a handle 115. According to the illustrated embodiment, the hand-held power tool 100 can be mechanically and electrically connected to a battery pack (not shown) for mains-independent power supply. Fig. Figure 1 shows the hand tool 100 as an example designed as a cordless drill / driver. However, it should be noted that the present invention is not limited to cordless drill / drivers, but can rather be applied to various hand tools in which a tool is set in rotation, for example in a cordless drill, a cordless impact drill, a stick screwdriver, or an impact drill.

[0029] The housing 105 contains a powered electric drive motor 180 and a gearbox 170. The drive motor 180 is connected to a drive shaft 120 via the gearbox 170. For illustrative purposes, the drive motor 180 is arranged in a motor housing 185 and the gearbox 170 in a gearbox housing 110, with the gearbox housing 110 and the motor housing 185 being arranged within the housing 105 by way of example.

[0030] The drive motor 180 can be operated, for example, via a manual switch, i.e., switched on and off, and can be any type of motor, such as an electronically commutated motor or a DC motor. Preferably, the drive motor 180 is electronically controllable in such a way that both reversing operation and specifications regarding a desired rotational speed are possible. The operating principle and construction of a suitable drive motor are sufficiently known from the prior art, so a detailed description is omitted here for the sake of brevity.

[0031] The drive shaft 120 is rotatably mounted in the housing 105 via a bearing arrangement and is provided with a tool holder 140, which is arranged in the area of ​​an end face 112 of the housing 105 and, for example, comprises a drill chuck 145. The tool holder 140 serves to hold a tool 150 and can be integrally formed with the drive shaft 120 or attached to it in an attachment manner.

[0032] Furthermore, the hand-held power tool has a first actuating element 202, which is used to select a gear of the gearbox 170, and a second actuating element 204, which is used to select the torque. The first actuating element 202 is designed as a rotary ring slide switch 202, which is preferably continuously displaceable on the housing 105 within a specific rotational angular range in the circumferential direction. The second actuating element 204 is designed as a push button switch. Alternatively, the actuating elements could each also be designed as rotary switches, push buttons, or slide switches.

[0033] As in the Fig. As can be seen from Figures 2 to 8, the transmission 170, according to one embodiment, is a planetary gear 100 designed with various gear or planetary stages, to which a torque clutch is assigned. During operation of the hand-held power tool 100, the planetary gear 170 is driven by the drive motor 180. It should be noted here that the design and operation of a planetary gear, as well as its interaction with the illustrated clutch for adjusting torque, are generally known, so that they will not be discussed further in this description.

[0034] The Fig. Figures 2 to 7 represent a first variant of an adjustment unit, in which an adjusting ring 220 is arranged to be displaceable radially below the adjusting element 200 and circumferentially around the housing 110. This adjusting ring 220 is connected to the adjusting element 200, or the slide switch 202, via a coupling element 222 such that movement of the adjusting element 200 can be transmitted to the adjusting ring 220. The adjusting ring 200 has at least two channels 230 in the circumferential direction, wherein the channels 230 are subdivided into a first section 232, which extends obliquely to the circumferential direction, and a second section 234, which extends circumferentially.

[0035] As in the Fig. 3 and Fig. As can be seen particularly well in Figure 4, two actuators 130, arranged to be displaceable only in the axial direction of the hand-held power tool 100, are connected to the housing 110 of the gearbox 170 in the illustrated embodiment, each actuator 130 having at least one connecting element 132. The actuators 130 engage in the channels 230 of the adjusting ring 220 via these connecting elements 132. A rotational movement of the adjusting ring 230 in the circumferential direction thus does not cause any movement of the actuators 130 if the connecting elements 132 are in the same position as shown in Figure 4. Fig. 6 shown, in the area of ​​the second sections 234 of the channels 230, whereas an axial movement of the actuators 130 is caused when the adjusting ring 220 is adjusted via the slide switch 202 and the connecting elements 132, as shown in Fig. 5 shown, move to the area of ​​the first section 132.

[0036] As in the Fig. As can be clearly seen in Figure 4, the actuators 130 are positively connected to a ring gear 175 of the transmission 170 via connecting means 134, such that the axial movement of the actuator 130 also causes an axial movement of the ring gear 175. The axial movement of the ring gear 175 influences the engagement of the transmission 170 and thus the speed levels.

[0037] In the Fig. Figures 7 to 11 show a second variant of an adjusting unit, in which, as in previous versions, an adjusting ring 220 is provided, arranged radially below the adjusting element 200 and circumferentially around the housing 110, so that movement of the adjusting element 200 can be transmitted to the adjusting ring 220. In this variant, the adjusting ring 200 also has at least two channels 230 in the circumferential direction, with the channels 230 extending almost entirely circumferentially. In this embodiment, the adjusting element 130, arranged only axially along the hand-held power tool 100, is connected to the housing 110 of the gearbox 170. The adjusting element 130 has approximately the shape of a bracket and engages positively in a groove of the ring gear 175 in such a way that additional connecting means between the ring gear 175 and the adjusting element 130 are unnecessary.

[0038] In the second variant shown, the actuator 130 has two axially opposing connecting elements 132. The actuator 130 engages in the channels 230 of the adjusting ring 220 via these connecting elements 132, so that rotational movement of the adjusting ring 230 in the circumferential direction also causes a rotational movement of the actuator 130 and thus also a movement of the connecting elements 132 in the channels 230.

[0039] Furthermore, the gearbox housing 110 has several first guide means 111 in the circumferential direction, which interact with several second guide means 224 of the adjusting ring 220 distributed around the circumferential direction and several third guide means 173 of a flange 172 distributed around the circumferential direction such that a rotational movement of the adjusting ring (220) in the circumferential direction causes an axial movement of the actuating element (130). As in the Fig. As can be clearly seen in Figure 9, the actuator 130 is positively connected to the ring gear 175 of the transmission 170 via connecting means 134 in such a way that the axial movement of the actuator 130 also causes an axial movement of the ring gear 175. The axial movement of the ring gear 175 thus influences the engagement of the transmission 170, which in turn enables at least two different gear ratios or speed levels.

[0040] This shows Fig. 10. The actuating element 200 is in a first position 601, wherein in this first position 601 the first guide means 111 of the gearbox housing 110 interact with the second guide means 224 of the adjusting ring 220 such that the second gear in the gearbox 170 is engaged via the actuating element 130 and the ring gear 175. In this way, different positions can be set on the hand-held power tool 100 via the actuating element 200, each representing an optimal basic setting for different applications. For example, this first position 601 can be optimized for "small screws" and thus represent a basic setting that includes the second gear with a high speed and low torque.

[0041] In Fig. In position 11, the actuating element 200 is in a second position 602, wherein the second guide means 224 of the actuating ring 220 interact with the first guide means 111 of the gearbox housing 110 and the third guide means 173 of the flange 172 such that the first gear in the gearbox 170 is engaged via the actuating element 130 and the ring gear 175. In this second position 602, for example, an optimized basic setting for "large screws" can be set, which has the first gear at a low speed and high torque.

[0042] Another third position 603, not shown, would be, for example, "drilling mode". This third position 603 would also include second gear with high speed and low torque; however, in this position, the engine control unit would automatically set a maximum speed and maximum torque.

[0043] Furthermore, a spring element 300 can be provided between the gearbox housing 110 and the slide switch 202, which holds the slide switch 202 in the different positions.

[0044] In Fig. Figure 12 shows that a circuit board is provided below the actuators 202 and 204, on which at least one first sensor 212 and one second sensor 214 are arranged. These sensors are capable of detecting the respective positions of the actuators 200, 202, and 204 and transmitting this information to a control unit, which is not shown or described in detail. In the illustrated embodiment, the position of the slide switch 202, and thus the angular position of the actuating ring 220, is detected by the first sensor 212 being designed as a photoelectric sensor. The slide switch 202 also has a switching element 216, which undergoes the same relative movement as the slide switch 202 and projects into a detection range of the sensor 212. Actuation of the slide switch 202 thus causes a relative movement of the switching element 216, which the sensor 212 detects and transmits a corresponding signal to the control unit.Furthermore, the illustrated embodiment has, in addition to the first sensor 212, a second sensor 214 which detects the position of the second actuating element 214, a pressure switch.

[0045] In principle, other sensors, such as Hall sensors, potentiometers, pressure sensors, and / or other optical sensors, each comprising at least one light-emitting transmitter and one light-receiving receiver as optical sensor components for object detection, or other sensors suitable for this purpose, can also be used, whereby both active and passive sensors can be employed. When using active sensors, it is very advantageous to dispense with the provision of a supply voltage for the sensor, thus enabling a very simple and cost-effective solution for detecting the position of the actuators 200, 202, 204. Preferably, sensors operating on a piezoelectric effect or according to electromagnetic induction can be used as active sensors.Alternatively, passive sensors can be used, which, although they require a supply voltage, enable the highly reliable and accurate detection of changing physical quantities. Preferably, capacitive, resistive, inductive, galvanomagnetic, or optical sensors can be used as passive sensors.

[0046] As in the Fig. 1 and Fig. As can be seen in Figure 12, the position of the actuating elements 200, 202, 204 detected by the sensors 212, 214, or the operating mode of the hand-held power tool 100 activated by the control system, can be visually displayed to the user by means of a first optical display device 400. In principle, a binary display, a numerical display, or an analog display would be conceivable as the display device 400. Fig.The first display device 400 shows only the position of the second actuating element 204, and the display device 400 is implemented using a plurality of LEDs. It is essential that, depending on the display of the first display device 400, the hand-held power tool 100 is in a corresponding or correlating operating state with different predefined parameters. In addition to or as an alternative to the first display device, a second display device 402 can be provided, which, for example, displays the motor control setting or the set torque. An LED display using different colors would be conceivable, so that the user can visually recognize which setting is currently in use.

[0047] In addition to the described and illustrated embodiments, further embodiments are conceivable, which may include further modifications and combinations of features.

Claims

[1] A hand-held power tool (100) comprising a transmission (170) in a housing (110) having a plurality of gears for transmitting a torque generated by a drive motor (180) to a drive shaft (120), at least one actuating element (200) provided on the housing (110), wherein at least one first sensor (212) is provided which detects a position of the actuating element (200) and sends a signal corresponding to this position to an electronic control of the hand-held power tool (100), wherein a second sensor (214) detects the position of a second actuating element (204) and sends a second signal corresponding to this position to the electronic control of the hand-held power tool (100), wherein an actuating ring (220) is provided, wherein the actuating ring (220) is arranged displaceably in the radial direction below the first actuating element (202) and in the circumferential direction of the housing (110),wherein the adjusting ring (220) has at least one channel (230) in the circumferential direction, , characterized by that at least one actuator (130) arranged to be displaceable only in the axial direction of the hand-held power tool (100) is connected to the housing (110), wherein the actuator (130) engages in the channel (230) of the adjusting ring (220) via at least one connecting element (132). [2] Hand tool (100) according to claim 1, characterized by that the controller activates a defined operating state on the hand-held power tool (100) with a combination of predefined parameters depending on the corresponding signal. [3] Hand tool (100) according to claim 1 or 2, characterized by that the at least one actuating element (200) is designed in the form of a mechanically directly actuated switch. [4] Hand tool (100) according to one of claims 1 to 3, characterized bythat a first actuating element (202) is a slide switch which can be displaced in the circumferential direction of the housing (110). [5] Hand tool (100) according to one of claims 1 to 4, characterized by that the adjusting ring (220) is connected to the first adjusting element (202) via a coupling element (222) in such a way that a movement of the first adjusting element (202) is transmitted to the adjusting ring (220). [6] Hand tool (100) according to one of claims 1 to 5, characterized by that the channel (230) runs obliquely to the circumferential direction in a first section (232) and in the circumferential direction in a second section (234). [7] Hand tool (100) according to claim 6, characterized bythat a rotary movement of the adjusting ring (220) in the circumferential direction causes an axial movement of the actuator (130) when the connecting element (132) is located in the region of the first section (232), and that a rotary movement of the adjusting ring (220) in the circumferential direction does not cause any movement of the actuator (130) when the connecting element (132) is located in the region of the second section (232). [8] Hand tool (100) according to claim 5, characterized by in that the gear housing (110) has at least one first guide means (111) in the circumferential direction and the adjusting ring (220) has at least one second guide means (224) in the circumferential direction, wherein the second guide means (224) cooperates with at least the first guide means (111) in such a way that a rotary movement of the adjusting ring (220) in the circumferential direction causes an axial movement of the actuator (130). [9] Hand tool (100) according to one of claims 1 to 8, characterized by that the transmission (170) has at least one ring gear (175), wherein the ring gear (175) is positively connected to the actuator (130) in such a way that a displacement of the actuator (130) in the axial direction causes an axial movement of the ring gear (175), wherein the axial movement of the ring gear (175) causes an engagement of the transmission (170) in at least two different speed stages. [10] Hand tool (100) according to claim 9, characterized by that the ring gear (175) is positively connected to the actuator (130) via connecting means (134) in the axial direction. [11] Hand tool (100) according to one of claims 4 to 10, characterized by that at least one spring element (300) is provided, wherein the spring element (300) holds the first actuating element (202) in the different positions. [12] Hand tool (100) according to one of claims 1 to 11, characterized by that at least one optical display device (400) is provided, wherein the display device (400) displays the position of the at least one actuating element (200) detected by the first sensor (212). [13] Hand tool (100) according to one of claims 2 to 12, characterized by that a second optical display device is provided which displays the operating state of the hand-held power tool (100) activated by the controller. [14] Hand tool (100) according to one of claims 1 to 13, characterized by that the gear (170) is a planetary gear (170). [15] Hand tool (100) according to one of claims 1 to 14, characterized by that the adjusting element (200) is provided for adjusting the torque and / or a gear of the transmission (170). [16] Hand tool (100) according to one of claims 1 to 15, characterized bythat the actuating element (200) is designed in the form of a slide switch, a pressure switch and / or a switch actuated by sensors.

Images