GB2415656A

GB2415656A - Hand tool machine with centring means between components

Info

Publication number: GB2415656A
Application number: GB0512637A
Authority: GB
Inventors: Dietmar Saur; Hardy Schmid
Original assignee: Robert Bosch GmbH
Current assignee: Robert Bosch GmbH
Priority date: 2004-06-23
Filing date: 2005-06-21
Publication date: 2006-01-04
Anticipated expiration: 2025-06-21
Also published as: CN1712193A; GB0512637D0; GB2415656B; DE102004030313A1; DE102004030313B4; CN100540232C

Abstract

Hand tool machine is provided comprising at least one first and one second hand tool machine components (10, 12). At least one centring means 14,16 is described for the machining of the first hand tool machine component 10, and provides for the centring the first hand tool machine component 10, relative to the corresponding second hand tool machine component 12. The first component 10 may be formed by a bearing flange. The second component can be formed by a gear case, with associated gear means 18. The gear means 18 may be supported both in the gear case, and in the first hand tool component 10. The centring means 14,16 can be integrally moulded on the second hand tool machine component 12, and partially moulded on said first hand tool machine component 10.

Description

24 1 5656 Hand tool machine

Background art

The invention proceeds from a hand tool machine according to the preamble of claim 1.

A hammer drill is already known, which has a gear case and a motor housing that are connected by an intermediate flange. In order to achieve an advantageous positioning of the intermediate flange relative to the gear case, a seating surface of the intermediate flange that is provided for correspondence with a seating surface of the gear case is post-worked.

Advantages of the invention The invention proceeds from a hand tool machine comprising at least one first and one second hand tool machine component.

It is proposed that at least one centring means provided for the machining of the first hand tool machine component is provided for centring the first hand tool machine component relative to the corresponding second hand tool machine component. "Centring" in the present context is to l be taken to mean, in particular, as exact a positioning as possible in radial direction and/or in peripheral direction of two corresponding hand tool machine components. In said case, "a centring means provided for the machining" is to be taken to mean a means that is used either to manufacture and/or to post-work the hand tool machine component.

Furthermore, "provided" is to be taken to mean "designed" and/or "equipped".

By virtue of the solution according to the invention, at least two corresponding hand tool machine components may be centred and/or positioned particularly exactly relative to one another without or with only a few additional processing steps.

The first hand tool machine component may be formed by various components deemed meaningful by the person skilled in the art, such as, for example, by a gear case part etc. It is however particularly advantageous for the first hand tool machine component to be formed by a bearing flange, thereby advantageously allowing the use of centring means that are simultaneously provided for centring the bearing flange during a postworking of one or preferably advantageously more bearing points of the bearing flange.

The more bearing points the bearing flange has, the more hand tool machine components the centring means may advantageously be used for. The bearing flange may therefore be formed from various materials deemed meaningful by the person skilled in the art, in a particularly advantageous manner, however, from metal or a high-strength plastics material, such as e.g. an aramid fibre reinforced plastics material etc. It is further proposed that the second hand tool machine component is formed by a gear case and at least one gear means is supported both in the first hand tool machine component and in the gear case. The centring means may therefore be used in a particularly advantageous manner to centre corresponding bearing points, which are disposed in separate hand tool machine components, relative to one another and a particularly advantageous bearing arrangement of the gear means may be achieved.

The solution according to the invention is in this case suitable for various gear means deemed meaningful by the person skilled in the art but in a particularly advantageous manner for gear means supported in an axially displaceable manner. By virtue of the centring means, a particularly exact mutual alignment of the bearing points may be achieved and an undesirable increase of friction caused by a bearing misalignment as well as a canting of the gear means supported in an axial displaceable manner may be avoided.

The bearing flange preferably further comprises a bearing point for a motor unit, such as for a motor housing and/or a motor shaft etc., thereby advantageously making it possible to achieve in a constructionally simple manner an exact alignment of the motor unit and in particular an advantageous alignment of the motor unit relative to a gear unit.

When the centring means is at least partially integrally moulded on the first hand tool machine component, additional processing steps may be avoided or at least simplified. The same applies when at least one centring means is integrally moulded on the second hand tool machine component.

The centring means of the first hand tool machine component may be formed by various components deemed meaningful by the person skilled in the art, such as, for example, by a fitted and/or integrally moulded bolt or in a particularly advantageous manner by an integrally moulded and/or introduced recess, thereby allowing the first hand tool machine component to be clamped in common post-working apparatuses.

When two centring means are disposed at least substantially diagonally relative to a centre line, advantageous centring may be achieved and easy assembly may be assisted by a small number of centring means, in particular preferably by only two centring means. In principle, however, more or fewer than two centring means are conceivable.

It is further proposed that a fastening means is passable through the centring means, thereby allowing an advantageous bracing to be achieved in the region of the centring means.

In a further development of the invention, it is proposed that the hand tool machine comprises at least one guiding means at least for assisting a connection of the first and the second hand tool machine component, namely in a particularly advantageous manner in the region of the centring means, thereby allowing assembly to be simplified and speeded up and costs to be reduced. The guiding means in said case may be formed by an inclined surface, such as, for example, by a cone, or by a stepped contour etc. Drawing Further advantages arise from the following description of the drawing. The drawing shows an embodiment of the invention. The drawing, the description and the claims contain numerous features in combination. The person skilled in the art will advantageously consider the features also individually and combine them into meaningful further combinations.

Description of the embodiment

Figure 1 shows a detail of a hand tool machine formed by a pistol-shaped hammer drill of a pot-type design, comprising a first hand tool machine component 10 formed by a bearing flange and a second hand tool machine component 12 formed by a substantially pot-shaped gear case.

The first hand tool machine component 10 formed by the bearing flange is manufactured in a pressure die-casting process from light metal, such as, for example, from aluminium or an aluminium alloy, and comprises two integrally moulded centring means 14, 16 formed by recesses, by means of which the first hand tool machine component 10 is clamped in a postworking device (not shown in detail) for the post-working of bearing points 20, 22 of the first hand tool machine component 10. For the postworking operation, the first hand tool machine component 10 is mounted by the centring means 14, 16 formed by recesses onto centring bolts of the post-working device and braced therewith.

According to the invention, the centring means 14, 16 are used in addition to centre and/or position the hand tool machine component 10 formed by the bearing flange in radial direction and in peripheral direction relative to the second hand tool machine component 12 formed by the gear case.

Integrally moulded on the second hand tool machine component 12, which is formed by the gear case and manufactured from plastics material, are two centring means 38, 40 formed by studs, which correspond with the centring means 14, 16 and which, when the first and second hand tool machine component 10, 12 are brought properly together, engage into the centring means 14, 16. The centring means 38, 40 of the second hand tool machine component 12 formed by the studs have at their free ends guiding means 30, 32 for assisting the connection of the first and the second hand tool machine component 10, 12 and/or for introducing the centring means 38, 40 of the second hand tool machine component 12 into the centring means 14, 16 of the first hand tool machine component 10. The guiding means 30, 32 are formed in this case by cones integrally moulded on the centring means 38, 40 of the second hand tool machine component 12 and additionally have a self-centring effect.

The centring means 14, 16 of the first hand tool machine component 10 are advantageously disposed at least substantially in a common parting plane extending transversely relative to a centre line 36 of the hand tool machine, at an equal distance from the centre line 36 and diagonally relative thereto. Instead of two diagonally disposed centring means 14, 16, however, fewer or more centring means are conceivable, which may be disposed in different parting planes and/or at different distances from the centre line 36.

In the first hand tool machine component 10 and in the second hand tool machine component 12 a gear means 18 formed by an intermediate shaft is supported in an axially displaceable manner. By means of a rotary switch (not shown in detail) the gear means 18 formed by the intermediate shaft may be displaced in axial direction and therefore switched over between an exclusively drilling mode, a hammer drilling mode and an exclusively chipping mode. Bearing points in the first hand tool machine component 10 and in the second hand tool machine component 12 may be coaxially exactly aligned by the centring means 14, 16, 38, 40.

Besides the bearing point (not shown in detail) for the gear means 18, the first and the second hand tool machine component 10, 12 have bearing points for a hammer tube 42, in which a piston drivable by means of a wobble bearing (not shown in detail) extends and which is gettable in rotation via the gear means 18 formed by the intermediate shaft and via a gearwheel connection 44.

The substantially centrally disposed bearing point 22 and the bearing point 20 disposed coaxially with the bearing point 22 are used to support components of a motor unit 24.

The bearing point 20 formed by a circular recess is used to support an armature shaft 34 of an electric motor of the motor unit 24, which is supported in a further bearing point (not shown in detail) in a substantially sleeve- shaped motor housing 46, and via which the gear means 18 formed by the intermediate shaft is drivable. The bearing point 20, which is formed by an outer periphery of a sleeve segment extending over cat 200 , is used to support the motor housing 46.

For assembly, the first hand tool machine component 10 and the second hand tool machine component 12 are brought together in axial direction. A rough centring occurs in said case by means of a sealing ring 48 disposed on the outer periphery of the first hand tool machine component 10. As they are brought further together, the centring means 38, 40 of the second hand tool machine component 12 are introduced into the centring means 14, 16 of the first hand tool machine component 10. The motor unit 24 is then guided in axial direction to the first hand tool machine component 10, wherein the motor housing 46 is slipped by its inner periphery onto the bearing point 20 formed by the outer periphery of the sleeve segment and is centred by the bearing point 20 in radial direction relative to the first and the second hand tool machine component 10, 12.

The motor housing 46 and the second hand tool machine component 12 formed by the gear case are then braced axially by means of four fastening means 26, 28 formed by screws and distributed uniformly over the periphery, wherein of the four fastening means 26, 28 only two are illustrated, which extend through the centring means 38, 40 of the second hand tool machine component 12 and through the centring means 14, 16 of the first hand tool machine component 10 into internal threads of the motor housing 46.

The first hand tool machine component 10 is clamped in between the motor housing 46 and the second hand tool machine component 12 formed by the gear case, wherein direct contact is avoided between the fastening means 26, 28 and the first hand tool machine component 10.

Bearing forces and operating forces effective during operation may advantageously be taken up and transmitted to corresponding components by the first hand tool machine component 10 formed by the bearing flange. Furthermore, the first hand tool machine component 10 may advantageously remove heat from the second hand tool machine component 12 formed by the gear case.

Reference characters hand tool machine component 12 hand tool machine component 14 centring means 16 centring means 18 gear means 2 0 bearing point 22 bearing point 24 motor unit 26 fastening means 28 fastening means 3 0 guiding means 3 2 guiding means 34 armature shaft 36 centre line 3 8 centring means 4 0 centring means 4 2 hammer tube 44 gearwheel connection 4 6 motor housing 4 8 sealing ring

Claims

Claims 1. Hand tool machine comprising at least one first and one second

hand tool machine component (10, 12), characterized in that at least one centring means (14, 16) provided for the machining of the first hand tool machine component (10) is provided for centring the first hand tool machine component (10) relative to the corresponding second hand tool machine component (12).
2. Hand tool machine according to claim 1, characterized in that the first hand tool machine component (10) is formed by a bearing flange.
3. Hand tool machine according to claim 1 or 2, characterized in that the second hand tool machine component (12) is formed by a gear case and at least one gear means (18) is supported both in the first hand tool machine component (10) and in the gear case.
4. Hand tool machine according to claim 3, characterized in that the gear means (18) is supported in a displaceable manner.
5. Hand tool machine at least according to claim 2, characterized in that the bearing flange comprises at least one bearing point (20, 22) for a motor unit (24).
6. Hand tool machine according to one of the preceding claims, characterized in that the centring means (14, 16) is at least partially integrally moulded on the first hand tool machine component (10).
7. Hand tool machine according to one of the preceding claims, characterized in that at least one centring means (38, 40) is integrally moulded on the second hand tool machine component (12).
8. Hand tool machine according to one of the preceding claims, characterized in that the centring means (14, 16) of the first hand tool machine component (10) is formed by a recess.
9. Hand tool machine according to one of the preceding claims, characterized in that two centring means (14, 16) are disposed at least substantially diagonally relative to a centre line (36).
10. Hand tool machine according to one of the preceding claims, characterized in that a fastening means (26, 28) is expendable through the centring means (14, 16).
11. Hand tool machine according to one of the preceding claims, characterized by at least one guiding means (30, 32) at least for assisting a connection of the first and the second hand tool machine component (10, 12).
12. Hand tool machine component (10), in particular a bearing flange, for a hand tool machine having at least one centring means (14, 16), which is provided for the machining of the hand tool machine and is additionally provided for centring at least two hand tool machine components (10, 12).
13. A hand tool machine substantially as herein described with reference to the accompanying drawings.
14. A centring component for a hand tool machine substantially as herein described with reference to the accompanying drawings.