WO2012072325A1

WO2012072325A1 - Hammer percussion mechanism

Info

Publication number: WO2012072325A1
Application number: PCT/EP2011/067966
Authority: WO
Inventors: Joachim Hecht; Heiko Roehm; Martin Kraus
Original assignee: Robert Bosch Gmbh
Priority date: 2010-11-29
Filing date: 2011-10-14
Publication date: 2012-06-07
Also published as: EP2646202A1; DE102010062102A1

Abstract

The invention proceeds from a hammer percussion mechanism having at least one percussion means (12a; 12b), a tool chuck drive shaft (14a; 14b) and a coupling means (16a; 16b) which is provided to transmit a rotary movement from the tool chuck drive shaft (14a; 14b) to a tool chuck (18a; 18b).It is proposed that the coupling means (16; 16b) is provided to transmit the rotary movement to the tool chuck (18a; 18b) through a cutout (20a; 20b) in the percussion means (12a; 12b).

Description

description

Hammer mechanism

State of the art

The invention relates to a hammer blower according to the preamble of claim 1.

It has already been proposed a hammer blower with at least one impact means, a tool chuck drive shaft and a coupling means which is provided for transmitting a rotational movement of the tool chuck drive shaft to a tool chuck.

Disclosure of the invention

The invention relates to a hammer blower with at least one impact means, a tool chuck drive shaft and a coupling means which is provided for transmitting a rotational movement of the tool chuck drive shaft to a tool chuck.

It is proposed that the coupling means is provided to transmit the rotational movement through a recess of the percussion means to the tool chuck. A hammer is to be understood as meaning, in particular, a bat and / or advantageously an anvil Preferably, the hammer percussion device comprises a percussion means which is designed as a racket and a percussion means which is designed as an anvil. "Hammer" means a hammer blower, which is intended to be accelerated during operation by the impact generating unit in particular translationally and one during the acceleration impulse delivered as a shock pulse in the direction of an insert tool. Preferably, the racket is unaccelerated immediately prior to a strike. The bat preferably gives the impact pulse over the striker to the insert tool in a stroke. A striker should in particular be understood to mean an element of the percussion mechanism which transmits the impact impulse from the striker toward the insert tool, at least in a percussion drilling operation Ingress of dust through the tool chuck into the hammer percussion mechanism

Shaft to be understood, which transmits in a drilling and / or Schlagbohrbetrieb a rotational movement of a transmission, advantageously a planetary gear in the direction of a tool chuck. Advantageously, the tool chuck drive shaft is at least partially formed as a solid shaft. Preferably, the tool chuck drive shaft extends in the direction of impact over at least 40 mm.

Preferably, the tool chuck drive shaft and the tool chuck in a drilling and / or percussion drilling operation, in particular always, a same speed, that is, in particular a drive train between the chuck drive shaft and the tool chuck is free of a transmission. A "direction of impact" is to be understood in particular as meaning a direction which runs parallel to an axis of rotation of the tool chuck and which is directed by the stick toward the tool chuck. Coupling means "should be understood in particular a means that is intended, at least by at least one

Positive fit to transmit a movement, preferably a rotational movement, from one component to another component. Advantageously, the coupling means has at least two interlocking elements and a region connecting the interlocking elements. The coupling means is preferably connected to the tool chuck and / or to the tool chuck drive shaft in a rotationally fixed and axially displaceable manner. Alternatively or additionally, the coupling means is rotatably connected either with the tool chuck drive shaft or with the tool chuck and fixed in the axial direction. In particular, the phrase "for transmitting a rotational movement" should be understood to mean that the tool chuck drive shaft effects a force on the coupling means in at least one operating state, which drives the coupling means in rotation, and in that the coupling means acts on the tool holder. causes lining in a force that rotatably drives the tool chuck. In particular, the term "tool chuck" should be understood to mean a device which is intended to fix an insert tool detachably, at least non-rotatably, directly by an operator, preferably without tools. Preferably, the spindle is formed integrally between the connections to the insert tool and to the coupling means, Alternatively, it could be formed in several pieces between the connections. "Provided" is to be understood in particular to be specially designed and / or equipped. A "recess" is to be understood in particular as a region delimited by a surface of the impact means and arranged on at least one straight line which intersects the surface of the impact means on two sides of the recess The notch may be delimited by the club or, preferably, the striker, alternatively, the striker and the club could collectively define the recess in one stroke, advantageously on at least one plane In particular, the phrase "through a recess" is to be understood as meaning that an area that transfers the force from the tool chuck drive shaft past the impact means to the tool chuck, at least partially within the recess of the tool chuck Schlagmittel angeord is net. The inventive design, an advantageously compact and effective hammer blower can be achieved with a particularly effective transmission of the rotational movement. In particular, the rotational movement is not transmitted via a coupling which is axially displaced in a stroke.

In a further embodiment, it is proposed that the percussion means comprise at least two mutually separate racket contact surfaces, whereby structurally simple, an easily removable and advantageous rotary transmission can be achieved. A "bat contact surface" is to be understood as meaning, in particular, a surface which, in particular, directly transmits the impact pulse from the striker to the striker, preferably the striker contact surface is oriented perpendicular to the direction of impact. that the racket contact surfaces are disjointed and formed on a plane defined by the racket contact surfaces.

Furthermore, it is proposed that the coupling means surround the impact means in at least one operating state on at least one plane, whereby a particularly robust transmission of the rotational movement is possible. In this context, the phrase "to enclose on at least one level" is to be understood in particular to mean that the coupling agent is the

Impact means on the level over a Wnkelbereich of more than 180 degrees, preferably more than 270 degrees, particularly preferably of 360 degrees surrounds. Alternatively or additionally, the coupling means could penetrate the impact means, the tool chuck and / or the Werkzeugfutterantnebswelle.

It is also proposed that the impact means surround the Werkzeugfutterantnebswelle on at least one plane, whereby a particularly small space requirement can be achieved.

In addition, it is proposed that the impact means, in particular the striker, is rotationally driven during operation together with the Werkzeugfutterantnebswelle, whereby the hammer impact mechanism requires very little space. By "driven in rotation with the Werkzeugfutterantnebswelle" should be understood in particular that the tool chuck shaft and the

Impact means, advantageously the striker rotatably and preferably coupled axially displaceable. Preferably, the Werkzeugfutterantnebswelle and the striker are stored together via at least one bearing.

Furthermore, it is proposed that the Werkzeugfutterantnebswelle is mounted axially movable for impact activation, whereby a particularly compact and advantageous impact connection can be achieved. In particular, "for impact activation" is to be understood as meaning that axial displacement of the tool chuck secondary shaft, in particular if an operator presses an insert tool against a workpiece, activates a impact generation unit Direction parallel to the axis of rotation at least 1 mm, preferably at least 2 mm, slidably mounted. In an advantageous embodiment of the invention, it is proposed that the coupling means and the tool chuck drive shaft are formed as separate components, whereby the hammer impact mechanism for maintenance can be easily removed. The term "separate components" is to be understood in particular as meaning components which are unconnected in a non-destructively disassembled state Alternatively, the tool chuck drive shaft and the coupling means could be formed in one piece In this case, the coupling means and the tool chuck would advantageously be connected in a rotationally fixed and axially displaceable manner In a further alternative embodiment, the tool chuck and the coupling means could be formed in one piece In this case, the coupling means and the tool chuck drive shaft would advantageously be connected in a rotationally fixed and axially displaceable manner.

Furthermore, it is proposed that the hammer impact mechanism has a rocker arm, which is intended to act on the percussion means, whereby structurally simple, a compact hammer impact mechanism can be provided. Alternatively or additionally, the racket could be accelerated by an air pressure in the direction of impact. A "rocker arm" is to be understood in particular as meaning a means which is mounted such that it can move about a pivot axis and which is intended to deliver a mechanical power received at a first coupling region to a second coupling region Preferably, the rocker arm is resilient, that is, the rocker arm has a spring constant of between 100 N / mm and 10 N / mm between the coupling regions. act "should be understood in this context, in particular, that the rocker arm causes a force on the racket, which accelerates the racket in the direction of impact and that the racket transmits the shock pulse resulting from this acceleration to the striker.

Furthermore, a hand tool with a hammer impact mechanism according to the invention is proposed. In this context, a "hand tool" is to be understood as meaning, in particular, a hand tool which appears expedient to the person skilled in the art, but preferably a drill, a hammer drill

Drill, a drill bit and / or a percussion hammer are understood. Preferably, the hand tool is designed as a battery hand tool, that is, in particular, the hand tool has a contact means which is provided to supply a drive motor of the hand tool from a hand tool battery connected to the contact means with an electrical energy.

drawing

Further advantages emerge from the following description of the drawing. In the drawing, two embodiments of the invention are shown. The drawing, the description and the claims contain numerous features in combination. The person skilled in the art will expediently also consider the features individually and combine them into meaningful further combinations.

Show it:

1 shows a hammer impact mechanism according to the invention with a striking means and a coupling means which encloses the striking means, in a sectional view,

Fig. 2 components of the hammer impact mechanism of Figure 1 in a perspective exploded view and

Fig. 3 shows another embodiment of the hammer mechanism of Figure 1 in a sectional view, wherein a coupling agent penetrates the percussion means.

Description of the embodiments

Figure 1 and Figure 2 show a hammer mechanism 10a of a hand tool, not shown. The hand tool is designed as a cordless drill driver. The hammer blower 10a has a striking means 12a, a tool chuck drive shaft 14a and a coupling means 16a. The coupling means 16a transmits, during operation, a rotational movement from the tool chuck drive shaft 14a to a tool chuck 18a of the hand tool. In FIG. 1, only one spindle of the tool chuck 18a is shown. The coupling means 16a has a connection region 28a and three coupling regions 30a. The connecting portion 28a connects the three coupling portions 30a. The connecting portion 28a is formed as a ring. It encloses part of the percussion means 12a and part of the chuck drive shaft 14a by 360 degrees in an operable state, on a plane 24a which is oriented perpendicular to a direction of impact 32a. The coupling portions 30a conduct the rotational movement from the tool chuck drive shaft 14a to the tool chuck 18a. For this purpose, the coupling regions 30a engage in recesses 34a of the tool chuck drive shaft 14a and in depressions in the radial direction

36a of the tool chuck 18a. The connecting portion 28a and the coupling portions 30a are formed integrally.

The percussion means 12a is formed as an anvil. The percussion means 12a defines three recesses 20a. The coupling regions 30a of the coupling means 16a are each partially disposed in one of the recesses 20a of the impact means 12a in an operational state. Thus, the coupling means 16a transmits the rotational movement of the tool chuck drive shaft 14a through the recesses 20a of the impact means 12a to the tool chuck 18a.

The percussion means 12a has three separate racket contact surfaces 22a. The racket contact surfaces 22a are separated by the recesses 20a. The percussion means 12a transmits in operation a shock pulse from the racket contact surfaces 22a via three adjacent to the recesses 20a portions 38a of the percussion means 12a in the direction of an insert tool, not shown. The portions 38a and the percussion means 12a are each partially disposed on the plane 24a which is perpendicular to the impact direction 32a. The areas 38a are bounded against the direction of impact 32a by the bat contact surfaces 22a. In the direction of impact 32a, the regions 38a have at least an extension of the same size as the recesses 20a.

The percussion means 12a is rotationally driven in operation together with the chuck drive shaft 14a. The coupling means 16a transmits the rotational movement by means of a positive connection to the striking means 12a. The tool chuck 18a has a locking means 40a which covers a movement range of the impact bounded by 12a in a direction opposite to the direction of impact 32a direction. The locking means 40a is formed as a clamping ring.

The hammer mechanism 10a has a rocker arm 26a and a racket 42a. The rocker arm 26a is driven to pivot at least in a percussion drilling operation by an eccentric element, not shown. The rocker arm 26a accelerates the racket 42a in the direction of impact 32a at least during a percussion drilling operation. After the acceleration, the racket 42a hits the striking means 12a. The racket 42a transmits a shock pulse obtained by the acceleration to the striking means 12a. The impact means 12a passes the impact pulse to the insert tool.

The tool chuck drive shaft 14a is axially movable for impact activation in the coupling means 16a and rotatably mounted together with the tool chuck 18a with a bearing, not shown, of the tool chuck 18a. Of the

Operator moves at least in a Schlagbohrbetrieb, on the insert tool, the tool chuck 18 a and the impact means 12 a, the tool chuck drive shaft 14 a against the direction of impact, in which he presses the Einsatzzeugzeug against a workpiece, not shown. As a result, a not shown coupling means of the tool chuck drive shaft 14a comes with a the eccentric at least in a percussion drilling driving, not shown shaft engaged.

FIG. 3 shows a further exemplary embodiment of the invention. The following descriptions and the drawings are essentially limited to the differences between the exemplary embodiments, with reference in principle also being made to the drawings and / or the description of the other exemplary embodiment with respect to identically named components, in particular with regard to components having the same reference numbers. To distinguish the embodiments of the letter a is the reference numerals of the embodiment in Figures 1 and 2 adjusted. In the embodiment of Figure 3, the letter a is replaced by the letter b.

FIG. 3 shows an alternative hammer percussion device 10b according to the invention with a percussion means 12b, a chuck drive shaft 14b and a

Coupling means 16b. The coupling means 16b is formed as a pin. It is axial firmly and rotatably connected to a tool chuck 18b, for example screwed and / or welded. The coupling means 16b is provided for transmitting a rotational movement from the Werkzeugfutterantnebswelle 14b on the tool chuck 18b. For this purpose, the coupling means 16b penetrates the Werkzeugfutteran- drive shaft 14b through a recess 44b, which is also designed as a slot. Alternatively, the recess 44b could also be formed as a slot open in the direction of impact 32b. Surfaces of the coupling means 16b arranged perpendicular to the circumferential direction of the tool feed countershaft 14b abut against the tool feed counterbore 14b. In a direction of impact 32b, the recess 44b has a greater extent than the coupling means 16b. Thus, the coupling means 16b is axially displaceable and rotatably connected to the Werkzeugfutterantnebswelle 14b.

The impact means 12b defines a recess 20b, which is formed as a slot. Alternatively, the recess 20b could also act as a counter to

Impact direction 32b open slot be formed. The coupling means 16b penetrates the recess 20b of the impact means 12b, in the radial direction. Surfaces 12b of the coupling means 16b arranged perpendicularly to the circumferential direction of the tool feed countershaft 14b bear against the striking means 12b. In the direction of impact 32b, the recess 20b has a greater extent than the coupling means 16b. Thus, the coupling means 16b is axially slidably connected to the impact means 12b. In addition, it is non-rotatably connected by contraction with the Werkzeugfutterantnebswelle 14b. No rotational movement is transmitted to the tool chuck 18b via this connection.

Claims

claims

A hammer blower having at least one impact means (12a, 12b), a tool chuck drive shaft (14a, 14b) and a coupling means (16a, 16b) adapted for transmitting rotary motion from the chuck drive shaft (14a, 14b) to a tool chuck (18a, 18b). is provided, characterized in that the coupling means (16a, 16b) is provided to transmit the rotational movement through a recess (20a, 20b) of the impact means (12a, 12b) on the tool chuck (18a, 18b).

2. Hammer impact tool according to claim 1, characterized in that the impact means (12a) at least two separate racquet contact surfaces (22a).

3. Hammer impact mechanism according to claim 1 or 2, characterized in that the coupling means (16a) surrounds the impact means (12a, 12b) in at least one operating state on at least one plane (24a, 24b).

4. Hammer impact mechanism according to one of the preceding claims, characterized in that the impact means (12a, 12b) the tool chuck drive shaft (14a, 14b) on at least one plane (24a, 24b) encloses.

5. Hammer impact mechanism according to one of the preceding claims, characterized in that the impact means (12a, 12b) is driven in rotation during operation together with the tool chuck drive shaft (14a, 14b).

6. Hammer impact mechanism according to one of the preceding claims, characterized in that the tool chuck drive shaft (14a, 14b) is mounted axially movable for impact activation.

7. Hammer impact mechanism according to one of the preceding claims, characterized in that the coupling means (16a, 16b) and the tool chuck drive shaft (14a, 14b) are formed as separate components.

8. Hammer impact mechanism according to one of the preceding claims, characterized by a rocker arm (26a, 26b), which is intended to act on the impact means (12a, 12b).

9. Hand tool with a hammer impact mechanism (10a, 10b) according to one of the preceding claims.