EP1526950A1

EP1526950A1 - Tool holding fixture for a machine tool

Info

Publication number: EP1526950A1
Application number: EP03763580A
Authority: EP
Inventors: Otto Baumann; Rolf Mueller; Dietmar Saur; Helmut Heinzelmann; Thomas Bernhardt; Hardy Schmid
Original assignee: Robert Bosch GmbH
Current assignee: Robert Bosch GmbH
Priority date: 2002-07-10
Filing date: 2003-06-27
Publication date: 2005-05-04
Also published as: JP2005532185A; US20050224243A1; WO2004007149A1; CN1665647A; CN100374253C; DE10230991A1

Abstract

The invention relates to a tool holding fixture for a machine tool, particularly for a hammer drill, provided with a locating opening (12) for holding a tool shank (14) and with a percussive pin (16). During operation, the tool shank (14) and/or the percussive pin (16) have/has an operating position located between an idle position and a percussive position. The inventive tool holding fixture also comprises a lubricant opening (56), which is stationary relative to the percussive pin (16) and which is provided for supplying lubricant, and comprises a lubricant valve (16, 56) having a variable valve control for dosing the lubricant. According to the invention, the valve control of the lubricant valve (16, 56) is dependent on the operating position of the percussive pin (16) and/or of the tool shank (14) between the idle position and the percussive position.

Description

Tool holder for a machine tool

The invention is based on a tool holder for a machine tool according to the preamble of claim 1.

From DE 198 05 187 AI a hammer drill with such a tool holder is known, which has a cylindrical receiving opening for receiving a tool shaft. The tool shank is locked in the receiving opening by a locking element. An axially oscillating firing pin strikes the tool shank during operation. The locking therefore enables axial play of the tool, so that the tool can avoid the strikes of the firing pin and transmit the hits to the machined workpiece.

Both the tool shank and the receiving opening are subject to considerable mechanical stresses during operation of the hammer drill and / or percussion hammer, so that forced lubrication is provided to reduce wear. For this purpose, a lubricant opening is provided in the wall of the receiving opening, which consists of a lubricant container is supplied with lubricant. In this case, a ball valve is arranged in the lubricant opening, which is opened by the tool shaft when the tool is inserted, as a result of which lubricant enters the receiving opening. In contrast, the ball valve closes the lubricant opening during operation so that no lubrication takes place.

From DE 198 05 187 AI it is also known to use other valve types instead of the ball valve, such as, for example, a temperature-dependent valve or a valve operated by centrifugal force in order to effect lubrication as required.

Finally, from DE 198 05 187 AI a tool holder with forced lubrication is known, in which the firing pin has a spring-loaded lubricant valve on its face, which opens when it hits the tool shaft, whereby lubricant is released into the receiving opening. The lubricant supply is therefore partially arranged in the firing pin and is therefore exposed to strong vibrations.

Advantages of the invention

The invention encompasses the general technical teaching of metering the lubricant as a function of the operating position of the firing pin and / or of the tool shaft in a tool holder with a movable firing pin (dopper) and a lubricant opening which is fixed relative to the firing pin, in order to meter during the Operation to achieve forced lubrication. The term “fixed lubricant opening” used in the context of the invention is to be understood generally and serves to differentiate it from the known forced lubrication described at the beginning, in which the lubricant opening is arranged in the end face of the movable firing pin, so that the lubricant supply is exposed to considerable vibrations during operation.

The lubricant is preferably metered in here by releasing or shutting off the lubricant opening by means of a lubricant valve, the releasing or shutting off taking place as a function of the operating position of the tool shank or as a function of the operating position of the firing pin.

The term “operating position” of the tool shank or firing pin used in the context of the invention is also to be understood generally and is only used to differentiate it from the known tool holder mentioned at the outset, in which the tool shaft only opens the lubricant valve when inserted into the receiving opening, whereas in FIG no lubrication occurs during normal operation.

In a preferred embodiment, the lubricant is metered as a function of the operating position of the

Firing pin, the firing pin being movable between an idle position and an operating position during operation.

In this embodiment, the lubricant opening is preferably opened when the firing pin is in the empty position. running position, whereas the lubricant opening is preferably closed when the firing pin is in the striking position. In this way, lubricant is supplied from the workpiece each time the tool is set down.

However, it is alternatively also possible that the lubricant opening is open when the firing pin is in the operating position, whereas the lubricant opening is closed when the firing pin is in the idle position. In this way, the lubricant supply is interrupted each time the tool is set down from the workpiece.

In addition, it is also possible to provide a plurality of lubricant openings which are actuated in different ways by the firing pin. For example, one lubricant opening can be opened in the idling position of the firing pin and closed in the firing position of the firing pin, whereas another lubricant opening is closed in each case in the idling position and opened in the firing position. One lubricant opening thus causes idle lubrication, while the other lubricant opening provides impact lubrication.

The lubricant opening for idling lubrication is preferably larger than the lubricant opening for impact lubrication. This means that only a small amount of lubricant is dosed during impact operation, whereas in idle mode after the tool has been set down a larger amount of lubricant is dispensed from the machined workpiece.

In a preferred embodiment of the invention, the lubricant opening is released or blocked by the firing pin, so that the firing pin and the lubricant opening form a lubricant valve. The firing pin is displaceable in a guide sleeve, the lubricant opening being arranged in the guide sleeve. The firing pin thus preferably forms a piston which is axially displaceably mounted in the guide sleeve and blocks or releases the lubricant opening.

In a preferred embodiment of the invention, the firing pin has three sections which adjoin one another in the axial direction. The middle section serves to control the lubricant valve so that the outer diameter of the firing pin in the middle section is substantially equal to the inner diameter of the guide sleeve. The two outer sections, on the other hand, serve to accommodate one

Strike from the racket or to pass a blow to the tool shank. The outer diameter of the firing pin is therefore preferably smaller in the two outer sections than the inner diameter of the guide sleeve. This offers the advantage that in the two outer sections of the

Firing pin an annular gap between the outer surface of the firing pin and the guide sleeve remains free, through which lubricant can flow. The lubricant can pass through the lubricant opening arranged in the guide sleeve either from the inside out or from the outside in.

However, the lubricant is preferably supplied within the guide sleeve, while the lubricant opening arranged in the guide sleeve merges on the outside into a lubricant channel which opens into the receiving opening in order to supply the tool shaft or the firing pin with lubricant.

The lubricant channel can open axially into the receiving opening, for example, so that the supplied lubricant first hits the end face of the tool shank inserted into the receiving opening. However, it is also possible for the lubricant channel to open laterally from the outside into the receiving opening, so that the lubricant supplied initially hits the outer surface of the tool shank.

The lubricant is preferably supplied through an integrated lubricant container, which can be arranged, for example, in the gear housing of the machine tool. Another way of supplying lubricant is that the supply can be made directly from the lubrication of the product. Such an arrangement of

Lubricant container has the advantage that a sufficient amount of lubricant can be accommodated. On the other hand, this arrangement of the lubricant container advantageously enables simple filling through a toggle handle bore in the transmission housing. The lubricant container is preferably connected to the inside of the guide sleeve by a lubricant channel.

In a preferred embodiment, the firing pin has at least one sealing element on its outside in order to reliably seal the lubricant opening. It is particularly advantageous if the firing pin has at least two sealing elements on its outside, which are arranged so axially offset from one another that the lubricant opening arranged in the guide sleeve is axially between the two sealing elements in an operating position of the firing pin. Here, the two sealing elements can seal the lubricant opening axially on both sides.

In the above-described embodiments, lubricant is generally only supplied in the idle position when the machine tool is set down from the workpiece and the firing pin has assumed its idle position. On the other hand, no lubricant is generally supplied during impact operation, since the firing pin is then in the impact position.

In a variant of the invention, on the other hand, it is provided that lubricant is also supplied during the striking operation if the firing pin is in the striking position. The lubricant is metered through the guide sleeve of the firing pin, the guide sleeve being axially displaceable by the firing pin and releasing the lubricant opening in an axial position. In this variant of the invention, the fact is preferably uses that the firing pin experiences an opposing B-stroke from the tool shaft after its impulse has been given to the tool sheep. The impulse of this B-impact is transmitted from the firing pin to the guide sleeve, which then shifts axially, thereby opening the lubricant opening. In this variant of the invention, lubricant is generally supplied with each stroke, so that sufficient lubrication is ensured even in the case of long-lasting operation with short breaks.

The B impact can be transmitted from the firing pin to the guide sleeve, for example, by means of a shoulder which is attached to the guide sleeve on the tool side and preferably protrudes inwards. During the axial displacement of the firing pin due to the B impact, the firing pin then abuts the shoulder of the guide sleeve and thereby takes it along in the axial direction. Instead of a shoulder, the entrainment of the guide sleeve during the B-stroke can also be achieved by other components which are fastened or molded onto the guide sleeve.

In this variant of the invention, a spring and / or damping element is preferably provided which, after the axial displacement caused by the B-stroke, returns the guide sleeve to its starting position in order to close the lubricant opening. For this purpose, an elastic ring is suitable, which can be designed, for example, as a rubber ring. The elastic ring can for example be arranged between a radially projecting collar of the guide sleeve and a counter bearing, so that the elastic ring during the B impact is compressed by the axial displacement of the guide sleeve. After the impulse transmission from the firing pin to the guide sleeve, the elastic ring then resumes its normal shape and thereby presses the guide sleeve into its starting position.

In this variant of the invention, the lubricant opening is preferably arranged on an end face of the guide sleeve, wherein the guide sleeve can preferably close the lubricant opening with one of its end faces. The guide sleeve is therefore in its starting position preferably with one of its end faces against a sealing element, which can be, for example, a ring. If the guide sleeve then lifts off from the sealing element due to the B impact, a gap is created between the sealing element and the guide sleeve, through which lubricant can be supplied.

For metering the lubricant, the sealing element is preferably elastic and has at least one lubricant opening which is closed in the starting position of the guide sleeve and opens when the guide sleeve is lifted off the sealing element. In this way it is achieved that not too much lubricant is supplied during a B-stroke, since no complete annular gap is released, but only the lubricant opening in the sealing element. The lubricant opening can be, for example, a notch which is arranged in a 0-ring used as a sealing element. However, it is not necessary within the scope of the invention that the lubricant opening is arranged in the sealing element against which the guide sleeve rests. Rather, it is also possible for the lubricant opening to be arranged in the guide sleeve and to be released or blocked by the sealing element.

In addition, it is also possible for the lubricant opening to be arranged in the lateral surface of the guide sleeve, the lubricant valve being designed as a slide valve, in that the lubricant valve m in the wall of the guide sleeve is sealed or released depending on the axial position of the guide sleeve.

In the variant of the invention described above with an axially displaceable guide sleeve, the valve position of the lubricant valve also depends on the position of the firing pin, since in the idle position of the firing pin no B-strokes are transmitted to the guide sleeve and consequently no lubricant is supplied. The actual metering of the lubricant supply takes place depending on the axial position of the guide sleeve.

In addition, the invention comprises a machine tool with the tool holder according to the invention described above. The tool holder according to the invention can be used particularly advantageously in a rotary hammer or chisel hammer, but the invention is not restricted to these types of machine tools. drawings

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

Show it:

1a shows a side sectional view of a tool holder according to the invention without an inserted tool,

1b shows a sectional view of a tool holder in a cross-sectional view, FIG. 4a, 4b shows a detailed view of a section from FIG 3 and FIG. 5 a sealing ring of the tool holder according to FIG. 3.

Description of the embodiments

FIGS. 1 a and 1 b show a tool holder of a rotary hammer, not shown, which has a holder body 10. The recording body 10 forms a Central receiving opening 12 into which an insertion end of a tool shank 14 of a drill or chisel can be inserted, as shown in FIG. 1b. A firing pin 16 (striker) projects into the receiving opening 12 on the meshing side and exerts axial impacts on the tool shank 14 when the rotary hammer is being operated.

The tool holder is provided in a known manner with a tool locking device which, in the example, comprises a locking element which is formed by a ball 18, which is arranged in an opening 20 m in the receiving body 10 and partially projects into the receiving opening 12 from the outside in a locking position. The ball 18 is prevented by a conically tapered design of the lateral dimensions of the opening 20 from completely immersing in the receiving opening 12. The ball 18 is covered radially by a locking ring 22 which can be axially displaced by means of an actuating sleeve 24 encompassing the receiving body 10. A spring 26 acts on the locking ring 22 with an axial force in the direction of the locking position, in which the locking ring 22 radially covers the ball 18. Between the spring 26 and the locking ring 22, a holding plate 28 is arranged, which retracts axially against the spring force when the tool shaft 14 is inserted. The locking ring 22 therefore only has to be actuated to unlock the tool shaft 14.

The tool-side end of the receiving body 10 is covered in a known manner by a dust protection cap 30, which rests against the tool shaft 14 when it is inserted, and so on prevents drilling dust from entering the receiving opening 12.

The tool holder is mounted on a gear housing 32 of the hammer drill, the holder body 10 being arranged within a guide tube 34 of the hammer drill and forming an interference fit with the guide tube 34. In addition, the receiving body 10 is axially fixed in the guide tube 34 by a retaining ring 36.

Furthermore, a locking ring 38 is provided to axially secure a guide sleeve 40 inserted into the guide tube 34, the firing pin 16 being axially displaceably mounted in the guide sleeve 40. The guide sleeve 40 is axially fixed in the guide tube 34 by the locking ring 38 and by a further locking ring 42.

A corrugated washer 44 is arranged between the guide sleeve 40 and the guide tube 34 of the hammer drill, which can be made of plastic, for example.

In addition to the corrugated washer 44 there is a sealing ring 46, which has a damping and sealing function, as will be described in more detail.

At the machine end of the guide sleeve 40, a conventional damping bushing 48 or safety device is also arranged.

The receiving body 10 has on its inside a step in which a guide body 50 is arranged, the Guide body 50 forms an axial tool-side stop for the firing pin 16 and thus limits the firing pin movement on the tool side.

The firing pin 16 itself essentially consists of three axially consecutive sections with different outside diameters. The middle section of the firing pin 16 is guided in the guide sleeve 40, so that the outside diameter of the firing pin 16 in the middle section is substantially equal to the inside diameter of the guide sleeve 40. Two sealing rings 52, 54, which seal a gap between the firing pin 16 and the guide sleeve 40 in the axial direction, are arranged in the central region in the outer lateral surface of the firing pin 16. The two axially outer sections of the firing pin 16, on the other hand, have a substantially smaller outer diameter, so that an annular gap is formed between the firing pin 16 and the guide sleeve 40 in these two sections.

In addition, a plurality of radially extending lubricant openings 56 are arranged in the guide sleeve 40, as can be seen in particular from the detailed illustration in FIG. 2. The lubricant openings 56 serve to supply lubricant from a lubricant container 58 which is arranged in the gear housing 32.

The functioning of the tool holder according to the invention is now described below, reference being made to the above description of the structural structure of the tool holder. In Figures la and lb, the firing pin 16 is shown above the line of symmetry in a striking position in which the firing pin 16 receives axial impacts from a striking body 60 of the hammer drill, which the firing pin 16 transmits to the tool shaft 14 with its tool-side end face.

Below the line of symmetry, the firing pin 16 is shown in FIGS. 1 a and 1 b in an idling position, in which the firing pin 16 rests with the tool-side flank of its central portion on the guide ring 50, the guide ring 50 forming an axial stop. In the idling position of the firing pin 16, the striking body 60 is received and held by the damping bushing 48 with its free end, so that the striking body 60 itself no longer experiences any strikes, as a result of which the vibrations are reduced in the idling position. The firing pin 16 assumes the idle position when the hammer drill is set down from the machined workpiece. When the hammer drill is reattached, the tool shank 14 then pushes the firing pin 16 axially in the direction of the striking body 60, the free end of the striking body 60 being pressed out of the damping bush 48.

In the striking position of the firing pin 16, the sealing ring 54 lies in the axial direction on the tool side in front of the lubricant openings 56, while the sealing ring 52 lies in the axial direction on the machine side behind the lubricant openings 56, so that the two sealing rings 52, 54 the lubricant openings 56 in the striking position of the firing pin 16 seal against the lubricant container 58, so that no lubrication takes place in the striking position of the striking pin 16.

In contrast, the sealing rings 52, 54 are in the idle position of the firing pin 16 both axially on the tool side in front of the lubricant openings 56, so that lubricant from the lubricant container 58 through the lubricant openings 56 into the space between the guide sleeve 40 and the guide tube 34 of the rotary hammer can occur. The sealing ring 46 seals the space between the guide sleeve 40 and the guide tube 34 on the machine side.

The guide sleeve 40 here has a circumferential collar 62, an annular gap remaining through the inside of the guide tube 34 and the collar 62, through which lubricant can flow axially. Here, the lubricant passes an open area of the locking ring 38 in the axial direction.

In this way, the lubricant reaches the intermediate space axially in front of the securing ring 38 between the guide sleeve 40 and the guide tube 34 and then flows further axially between the guide sleeve 40 and the receiving body 10 in the direction of the receiving opening 12.

The lubricant flow then divides when it emerges from the gap between the guide sleeve 40 and the receiving body 10, part of the lubricant flowing past the guide body 50 on the inside, while another part of the lubricant flows along the outside of the guide body 50. The The two lubricant flows then combine on the tool side at the front of the guide body 50 and finally enter the receiving opening 12.

During operation of the hammer drill, there is therefore forced lubrication of the tool shank 14 and the receiving opening 12 when the hammer drill is temporarily removed from the machined workpiece, the firing pin 16 assuming the idle position.

It is particularly advantageous here that no special operation by the user is required, which is particularly important for devices for the home improvement market.

In addition, the arrangement of the lubricant reservoir 58 in the gear housing 32 enables a large supply of lubricant.

Furthermore, the arrangement of the lubricant container 5 l in the gear housing 32 enables simple lubricant filling through a toggle handle bore in the gear housing 32.

Finally, the lubricant openings 56 in the guide sleeve 40 can advantageously be produced with narrow manufacturing tolerances in the laser drilling method, lubricant metering being possible by varying the size, arrangement and number of the lubricant openings.

The exemplary embodiment of a tool holder shown in FIGS. 3, 4a, 4b and 5 largely corresponds to the exemplary embodiment described above, so that to avoid repetition, reference is made to the above description. Corresponding reference numerals, which are only identified by an apostrophe, are also used below for corresponding components.

A special feature of this exemplary embodiment is that the lubricant is not supplied to the receiving opening 10 'only when the hammer drill is set down from the workpiece and the firing pin 16' assumes the idle position.

Rather, in this exemplary embodiment of a tool holder according to the invention, a lubricant is also supplied into the receiving opening 12 ′ during the striking operation when the striking pin 16 ′ is in the striking position.

This is achieved in the tool holder according to the invention in that the lubricant is metered through the guide sleeve 40 ', which is axially displaceably mounted for this purpose. The guide sleeve 40 'is displaced by the firing pin 16', which after its striking movement directed towards the tool shaft 14 'receives a counter-impulse from the tool shaft 14', which is also referred to as a B-stroke. This B-stroke leads to an axial movement of the

Firing pin 16 'away from the tool shaft 14', the firing pin 16 'striking a shoulder 64 which is formed on the inside of the guide sleeve 40' on its side facing away from the tool shaft 14 '. When the firing pin 16 'strikes the shoulder 64 of the guide sleeve 40', the guide sleeve 40 'is axially entrained and loaded. moves axially from its initial position into a lubrication position in which lubricant is dispensed into the receiving opening 12 ', as will be described in detail.

The axial movement of the guide sleeve 40 'during the B-stroke is intercepted by a spring and damping element 66 in the form of a rubber ring near the lubrication position and thereby damped. For this purpose, the guide sleeve 40 'has on its workpiece end face a radially outwardly projecting collar 68, against which the spring and damping element 66 bears. On the side axially opposite the collar 68, the spring and damping element 66 abuts an end face of a sintered bearing bush 70, so that the spring and damping element 66 is axially compressed during the axial movement of the guide sleeve 40 'from the initial position into the lubricating position. In addition to damping the axial movement of the guide sleeve 40 'during the B-stroke, the spring and damping element 66 also has the task of bringing the guide sleeve 40' back into the starting position after the B-stroke. This is done by the spring force that the spring and damping element 66 compressed during the B-stroke exerts in the compressed state on the collar 68 of the guide sleeve 40 'and thereby presses it in the direction of the workpiece.

In the initial position of the firing pin 16 'shown in FIG. 4a, the collar 68 of the guide sleeve 40' lies against an O-ring 72, which is shown in an axial front view in FIG. 5, with the collar 68 of the guide sleeve 40 'and the O. -Ring 72 has a substantially annular sealing surface that prevents lubricant between the O-ring 72 and the collar 68 of the guide sleeve 40 'can penetrate radially from the outside into the receiving opening 12'.

In contrast, in the lubricating position of the guide sleeve 40 'shown in FIG. 4b, the guide sleeve 40' is slightly axially lifted off the O-ring 72, as a result of which a radially extending lubricant opening 74 in the O-ring 72 is opened, so that lubricant is radially from the outside can penetrate through the lubricant opening 74 in the O-ring 72 into the receiving opening 12 '. However, the annular sealing surface between the O-ring 72 and the collar 68 of the guide sleeve 40 'is only interrupted in the lubricating position of the guide sleeve 40' where the lubricant opening 74 is in the O-ring 72, which here is a notch in the O -Ring 72 is executed. In this way, the quantity of lubricant supply 74 is limited to the cross section of the lubricant opening 74, so that the lubricant supply can be metered with different lubricant openings 74 by using different O-rings 72.

It should also be mentioned that the firing pin 16 'in this exemplary embodiment has only a single sealing ring 52', which only has the function of sealing the lubricant chamber 58 on the workpiece side, whereas the lubricant metering in this exemplary embodiment is not carried out by the sealing ring 52 'of the firing pin 16 ' he follows.

The invention is not restricted to the preferred exemplary embodiment described above. Rather, a large number of variants and modifications are possible, which if make use of the idea of the invention and therefore fall within the scope of protection.

reference numeral

10, 10 'receiving body 54 sealing ring

12, 12 'receiving opening 56, 56' lubricant opening

14, 14 'Tool shank 58, 58' Sch iermi11e1räum

16, 16 'firing pin 60, 60' impact body

18, 18 'ball 62 collar of the guide sleeve

20, 20 'opening 64 shoulder of the guide sleeve

22, 22 'Locking ring 66 spring and damping element

24, 24 'actuating sleeve 68 collar of the guide sleeve

26, 26 'spring 70 sintered bearing bush

28, 28 'retaining plate 72 O-ring

30, 30 'dust protection cap 74 lubricant opening

32, 32 'gearbox

34 guide tube

36 circlip

38 circlip

40, 40 'guide sleeve

42 circlip

44 corrugated washer

46 sealing ring

48 damping bush

50, 50 'guide body

52, 52 'sealing ring

Claims

Expectations

1. Tool holder for a machine tool, in particular for a hammer drill and / or a hammer, with a receiving opening (12, 12 ') for receiving a tool shaft (14, 14') and with a firing pin (16, 16 '), the tool shaft (14, 14 ') and / or the firing pin (16, 16') in operation has an operating position lying between an idle position and a striking position, a lubricant opening (56, 74) which is fixed relative to the firing pin (16, 16 ') for the supply of lubricant and with a lubricant valve (16, 56, 68, 72) with a variable valve position for lubricant metering, characterized in that the valve position of the lubricant valve (16, 56, 68, 72) depends on the operating position of the firing pin (16, 16 ') and / or the tool shank (14, 14') between the idle position and the striking position.

2. Tool holder according to claim 1, characterized in that the lubricant valve (16, 56) in the idle position of the firing pin (16) is open and in the striking position of the firing pin (16) is closed.

3. Tool holder according to at least one of the preceding claims, characterized in that the firing pin (16) in a guide sleeve (40) is displaceable, the lubricant opening (56) being arranged in the guide sleeve (40).

4. Tool holder according to claim 3, characterized in that the firing pin (16) has three axially successive sections, the central portion of the firing pin (16) having an outer diameter which is substantially equal to the inner diameter of the guide sleeve (40), while the outer diameter of the two outer sections of the firing pin (16) is smaller than the inner diameter of the guide sleeve (40).

5. Tool holder according to claim 3 and / or claim 4, characterized in that the lubricant opening (56) on the outside of the guide sleeve (40) merges into a first lubricant channel, which opens into the receiving opening (12, 12 ').

6. Tool holder according to claim 5, characterized in that the first lubricant channel opens substantially axially into the receiving opening (12).

7. Tool holder according to at least one of claims 3 to 6, characterized in that the guide sleeve (40) merges inside into a second lubricant channel which opens into a lubricant chamber (58).

8. Tool holder according to at least one of the preceding claims, characterized in that a gear housing (32) is provided, wherein the lubricant chamber (58) is integrated in the gear housing (32).

9. Tool holder according to at least one of claims 3 to 8, characterized in that the firing pin (16) has on its outer surface at least one sealing element (52, 54) to seal a gap between the firing pin (16) and the guide sleeve (40) ,

10. Tool holder according to claim 9, characterized in that the firing pin (16) on its outer surface has at least two sealing elements (52, 54) which are axially spaced from one another, the lubricant opening (56) in the guide sleeve ( 40) is in an operating position of the firing pin (16) axially between the two sealing elements (52, 54).

11. Tool holder according to at least one of the preceding claims, characterized in that a guide sleeve (40 ') from the firing pin (16') is axially displaceable and the valve position of the lubricant valve (72, 68) from the axial position of the guide sleeve (40 ') is dependent.

12. Tool holder according to claim 11, characterized in that a spring and / or damping element (66) is provided for the axial return of the guide sleeve (40 ') in an initial position.

3. Machine tool with a tool holder according to at least one of the preceding claims.