CN1636681A - Hand tool - Google Patents

Abstract

The invention relates to a hand-held power tool with a housing (12), in which a drive unit (16, 18, 20, 22) is accommodated, wherein at least one Vibration reduction device. It is proposed that a drive (14) with at least one drive unit (16, 18, 20, 22) be decoupled relative to the housing (12) via the damper in the axial, radial and circumferential directions.

Description

hand tool machine

technical field

The invention relates to a hand-held power tool.

Background technique

A hand-held power tool with a motor housing is known from DE 4000861 C2, which is surrounded by a containment housing on the side of the percussion drill facing away from the tool holder. A handle with a grip element is integrally formed on the containment housing. The containment housing is connected via a vibration damper to the motor housing, which at the same time forms an element for carrying the handle. The damping device has a plurality of elastic damping units made of rubber, by means of which the receiving housing and the gripping element are decoupled from the motor housing in vibration.

Contents of the invention

According to the invention, a hand-held power tool is proposed having a housing in which a drive unit is accommodated, wherein at least one vibration damping device is arranged in the housing, which is characterized by at least one drive unit A drive is decoupled relative to the housing via the damper in the axial, radial and circumferential directions.

The invention starts from a hand-held power tool with a housing in which a drive unit is accommodated, wherein at least one vibration damping device is arranged in the housing.

It is proposed that a drive with at least one drive unit is decoupled relative to the housing via the damper in the axial, radial and circumferential directions. Possible machine vibrations can be attributed to these three vibration directions. At the same time, the offset of the center axis of each drive unit in the drive device can be compensated. The mode of action and operation of the hand-held power tool are not affected.

If the drive device comprises at least one drive motor and/or a transmission and/or a clutch and/or a tool drive along the direction of longitudinal extension, it is possible to apply damping The vibration units are purposefully positioned on different drive units. Advantageously, since additional compensating elements or complex and expensive housing inner contours can be dispensed with, possible center axis offsets of drive units which are combined in a rigid drive can be compensated cost-effectively.

In an advantageous development, the damping device has a first damping unit for damping at least axial vibrations, wherein the first damping unit is preferably arranged on an end face of a drive motor which is arranged on One end face of the drive unit. Thereby, the drive device can be supported in the axial direction, and at the same time, vibration energy in the axial direction is isolated from the housing. Simultaneously, the first damping unit can compensate for a possible offset of the central axis of the drive unit in the axial direction, ie in the longitudinal direction. The second damping unit can also support the drive in the radial direction. The damping unit is preferably a rubber element, or can be a compression spring, a helical compression spring or other elements considered suitable by a person skilled in the art.

In an advantageous configuration, the damping device includes a second damping unit for damping at least radial vibrations, wherein the second damping unit is preferably arranged in the circumferential direction around the transmission of the drive. As a result, vibrations of the drive in the radial direction can be isolated from the housing. At the same time, the second damping unit can compensate for possible radial offsets of the central axis of the drive unit.

It is also advantageous if the damping device comprises a third damping unit for damping vibrations in at least the circumferential direction, wherein the third damping unit is arranged in the region of a clutch of the drive. As a result, vibrations of the drive in the circumferential direction can be isolated from the housing. The third damping unit can simultaneously compensate possible angular offsets of the central axis of the drive unit. The third damping unit may also support the drive device in the radial direction.

The damping unit is preferably made of a soft, rubber-like material. Other types of vibration-absorbing materials are also conceivable, such as composite articles, springs, and the like. The application of the invention is independent of the type of interconnection of the housing parts. A single damping unit can also be configured or designed accordingly in order to damp vibrations in different vibration directions.

If the drive unit is formed as a substantially rigid unit, the drive unit can advantageously be supported exclusively by the damper unit by means of a suitable distribution of the damper units of the damper unit. As a result, the drive can be virtually completely decoupled from the housing. The drive preferably bears against the housing only via the vibration damper. The good handling and mode of operation of the hand-held power tool is preserved.

The solution according to the invention can be used on different machine tools which are considered suitable by the specialist, but it is particularly advantageous to use on electric hand-held machine tools, such as percussion drills, scrapers, saws, screwdrivers and especially angle grinders, etc. Vibrations are prone to occur due to mostly free movement and generally high drive speeds. It is very advantageous to use on hand-held power tools that do not have an additional handle or no additional grasping device outside the containment structure, but the housing itself is a handle, such as hand-held screwdrivers , Industrial screwdrivers with adjustable closing torque, etc.

Description of drawings

Further advantages emerge from the following description of the figures. An exemplary embodiment of the invention is shown in the drawing. The drawing, the description and the claims contain numerous features in combination. Depending on the purpose, the skilled person can consider these features individually or in other meaningful combinations.

The accompanying drawings indicate:

Fig. 1 is a longitudinal section of a preferred hand-held screwdriver,

Fig. 2 Cross-section through a region with damping elements damped in the tangential direction.

Detailed ways

FIG. 1 shows a longitudinal section through a part of a hand power tool 10 designed as a screwdriver mechanism. A housing 12 encloses a drive unit 14 which has a first drive unit 16 formed as a motor, a second drive unit 18 formed as a transmission, and a third drive unit 18 formed as a clutch, in particular an overrunning clutch. unit 20 and a fourth drive unit 22 designed as a tool drive. The drive units 16 , 18 , 20 , 22 are arranged along the longitudinal extension direction 52 of the drive device 14 . The drive units 16 , 18 , 20 , 22 have center axes 24 , 26 , 28 , 30 which ideally form a common center axis, but which can also be offset relative to each other, for example for manufacturing reasons. A shaft 56 extends from the second drive unit 18 designed as a transmission to the fourth drive unit 22 designed as a tool drive. The drive units 16 , 18 , 20 , 22 of the drive device 14 are substantially rigidly coupled to one another.

A first damping unit 32 , which is provided for damping at least axial vibrations, is arranged on an end face 38 of the first drive unit 16 designed as a drive motor. A second damping unit 34 , which is provided for damping at least radial vibrations, is arranged in the circumferential direction on a circumference 40 around the second drive unit 18 designed as a transmission. A third damping unit 36 , which is provided for damping vibrations acting at least in the circumferential direction, is arranged in the region of the third drive unit 20 designed as a clutch and surrounds a bolt 42 there. The individual damping units 32 , 34 , 36 are components of a damping arrangement.

A fourth drive unit 22 , which is designed as a tool drive, is connected to the third drive unit 20 , which is designed as a clutch. The fourth drive unit has an angular transmission 58 . Drive 14 is mounted on housing 12 overall only via damping units 32 , 34 , 36 . Furthermore, a damping unit 60 is provided which surrounds a sleeve 62 of the third drive unit 20 designed as a clutch.

Also provided in the region of the third drive unit 20 , which is designed as a clutch, are screws 48 , 50 and a series of other screws (not shown in detail), which connect the half shells of the housing 12 to one another.

FIG. 2 shows a cross section through a region with a third damping unit 36 damped in the tangential direction. Components which remain substantially the same are in principle given the same reference numerals. Furthermore, reference can be made to the description of FIG. 1 with regard to the same features and functions.

The two half shells 64 , 66 forming a containment housing 12 are connected to each other in a first hole 44 by means of a screw 48 and in a second hole 46 by means of a screw 50 . A sleeve 62 ( FIG. 2 ) of the third drive unit 20 designed as a clutch is situated toward both sides of a bolt 42 in the lower half-shell 66 and a bolt 68 in the upper half-shell 64 . In the middle is a hole through which a shaft can pass. Both bolts 42 , 68 are each surrounded by a damping unit 36 .

Claims (10)

1. Hand-held power tool with a housing (12) in which a drive unit (16, 18, 20, 22) is accommodated, wherein at least one vibration damping device is arranged in the housing (12) , characterized in that a drive unit (14) with at least one drive unit (16, 18, 20, 22) moves axially, radially and circumferentially relative to the housing (12) via the damping device couple. 2. The hand-held power tool as claimed in claim 1, characterized in that the drive (14) comprises at least one drive motor and/or a transmission and/or a clutch and /or a tool driver. 3. The hand-held power tool as claimed in claim 1 or 2, characterized in that the damping device comprises a first damping unit (32) for damping at least axial vibrations. 4. The hand-held power tool as claimed in claim 3, characterized in that the first damping unit (32) is arranged on an end face (38) of a drive motor arranged on an end face of the drive device (14) )superior. 5. The hand power tool as claimed in claim 1, characterized in that the damping device comprises a second damping unit (34) for damping at least radial vibrations. 6. The hand-held power tool as claimed in claim 5, characterized in that the second damping unit (34) is arranged in the circumferential direction around a transmission of the drive (14). 7. The hand-held power tool as claimed in claim 1, characterized in that the damping device comprises a third damping unit (36) for damping vibrations at least in the circumferential direction. 8. The hand-held power tool as claimed in claim 7, characterized in that the third damping unit (36) is arranged in the region of a clutch of the drive (14). 9. The hand-held power tool as claimed in claim 1, characterized in that the drive (14) forms a substantially rigid unit. 10. The hand-held power tool as claimed in claim 1, characterized in that the drive (14) is mounted on the housing (12) exclusively via the at least one damper (32, 34, 36).