JP2002160181A - Chamber having lubricant and machining tool comprising pressure compensator therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a machining tool to separate favorably air from lubricant, by a filter element and to achieve always favorable self-cleaning of the filter element by a centrifugal force acting on the filter element during an operation. SOLUTION: A centrifugal mechanism component is formed with the filter element 20.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a method and a method for manufacturing a vehicle, comprising the steps of:
The invention relates to a machine tool, in particular a hand-held hammer drill, provided with a pressure-compensating device (16, 18) of said chamber (10), comprising a chamber (10) with lubricant and at least one centrifuge component which can be driven in rotation. .

[0002]

BACKGROUND OF THE INVENTION German Patent Application Publication No. 423
A machine tool of the type described above,
In particular, hand-held hammer drills are known. This known hammer drill is located in the motor chamber of the casing,
A drive motor having a motor shaft, wherein the motor shaft extends through the casing member into the power transmission chamber, and drives the tool housing via a pinion integrally formed in the power transmission chamber. Gears of the transmission to engage. The transmission chamber is provided with a pressure compensator for reducing the pressure generated during operation in the transmission chamber with respect to the atmosphere or the motor chamber. The pressure compensating device has a pressure compensating passage which is configured as a hole and communicates with the outside or the motor chamber from the transmission chamber, and the pressure compensating passage is provided in the casing member.

[0003] The pressure compensating passage is shielded by a rotating member or a centrifuge component rotatably supported by a pin integrally formed with the casing member in the transmission device chamber. The rotating member is formed by a pot-shaped thin plate member provided with a flow portion. Said rotating member is operatively connected via a compression spring with a gear of a transmission driven via a pinion, the end of which, on the one hand, is formably engaged with the gear. On the other hand, it is frictionally engaged with the rotating member. The compression spring transmits the rotational movement of the gear to the rotating member.

[0004]

The object of the present invention is to avoid the known disadvantages.

[0005]

According to the present invention, a centrifuge component is formed by a filter element.

[0006]

SUMMARY OF THE INVENTION The present invention relates to a machine tool, in particular a hand-held hammer drill, comprising a lubricant-containing chamber and at least one rotatable centrifugal mechanism in which at least one rotatable component is arranged. Starting from the type in which a pressure compensating device for the chamber is provided, having a component.

It is proposed that the centrifuge component is formed by a filter element. By means of this filter element, preferably air and lubricant are separated, and advantageous self-cleaning of the filter element can always be achieved by centrifugal forces acting on the filter element during operation. The filter element provides an advantageous ventilating and sealing function over a long service life. The arrangement according to the invention is particularly suitable for low-viscosity lubricants, so that it can be used, for example, particularly advantageously for oil-lubricated hammer drills. However, in principle, it is also advantageous to use lubricants with high viscosity.

[0008] Especially in the case of hand-held machine tools, the motor shaft often has a much higher rotational speed than the existing transmission shaft. In the case of a component which can be driven in this way by a motor shaft, such as a motor shaft of a hammer drill and / or a hammer of a hammer drill and / or a breaking hammer, advantageously a particularly high centrifugal force is applied for self-cleaning. Can be used for However, it is in principle also conceivable for the filter element to be arranged on the transmission shaft.

[0009] The centrifuge components can have a variety of configurations deemed advantageous to those skilled in the art, and may be directly or indirectly coupled to a single shaft. The components of the centrifuge may be constituted, for example, by rectangular parallelepiped individual members distributed over the entire circumference. These individual components are
It is held by a special holding device which is arranged so that it cannot rotate relative to the shaft. However, it is particularly advantageous if the centrifuge components are formed by annular components. The annular surface can be sealed with a simple configuration by one component. Furthermore, the centrifuge components can be simply arranged directly on the shaft, reducing additional components, construction space, installation effort and weight.

In another advantageous embodiment of the invention, the annular centrifuge component is non-rotatable relative to the rotatable component by means of an annular holding component with individual axially extending holding members. It is proposed that the Reliable holding of the centrifuge components is obtained, and the individual holding members prevent undesired deformation of the centrifuge components due to centrifugal force. Can be

As a centrifuge component or a filter element, a felt seal is particularly suitable, which can be produced particularly inexpensively and has properties which have proven to be advantageous. The filter element may be formed from a wide variety of fibrous materials, such as animal hair, vegetable fibers and / or synthetic fibers, which the skilled person will find advantageous.

If the centrifuge component is arranged immediately before the bearing of the component which can be driven in rotation when viewed in the direction of ventilation of the chamber, the centrifuge component is additionally used for sealing the bearing. , Additional components can be reduced. Further advantageously, a bearing can be used to form at least a part of the lubricant seal of the pressure compensator capable of compensating the pressure in the chamber. This reduces additional components, configuration space, weight, installation effort and costs. This is achieved in a particularly simple and inexpensive manner by a lubricant seal configured as a gap seal arranged between the bearing and the bearing seat, wherein the gap seal is provided by the outer ring and / or the bearing.
Alternatively, it may be arranged between the inner ring and the bearing seat. In addition, a lubricant seal, which is simultaneously available for pressure compensation, can be provided, for example, with a passage through the cage of the rolling bearing and / or
Or it could be formed by a passage through the bearing, such as a passage through a bearing seal disk suitably fixed to the bearing.

In a further advantageous refinement of the invention, it is proposed that a pressure compensation channel be provided in the bearing surface of the bearing and / or the bearing surface of the bearing seat. An advantageous cross section for pressure compensation is obtained with a simple construction, while at the same time providing a gap seal and / or a labyrinth seal. In this case, the pressure compensating passage may be provided, for example, in the form of an axial groove in the shaft, the inner ring of the rolling bearing, the outer ring of the rolling bearing and / or a component forming the outer bearing seat.

An advantageous labyrinth action or labyrinth seal is obtained if the pressure compensating passage is formed at least in part by a thread-shaped recess, and the thread direction and the rotational direction are also matched to one another. Thereby, a return effect is obtained. Threaded recesses may also be provided in the bearing and / or the bearing seat. If the pressure compensating passage opens into at least one annular groove, the pressure compensating passage is particularly simple and inexpensive so that it opens into the second annular groove, for example, starting from the first annular groove during a turning operation. Can be manufactured.

The arrangement according to the invention can be used on any machine tool which would be advantageous to the person skilled in the art, in particular on a hand-held machine tool such as, for example, a grinder, saw, milling machine, planer, drill, hammer.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 schematically shows a hammer drill having a casing 42 in which a drive motor 46 is supported in a motor chamber 44.
The tool holding unit 4 is driven by the drive motor 6 via a transmission device (not shown in detail) disposed in the transmission device chamber 10.
8 and a drill bit 5 fixed to the tool holder 48
0 indicates that rotation and impact driving are possible. The transmission chamber 10 contains a lubricant for lubricating the transmission. The hammer drill can be guided with two handgrips 52, 54 extending substantially perpendicular to the direction of operation. In this case, the hand grip 52 is formed integrally with the casing 42 on the side opposite to the drill bit 50, and the hand grip 54 is fixed to the casing on the side facing the drill bit 50.

The drive motor 46 has a drive shaft 12 which penetrates from the motor chamber 44 through the aluminum intermediate wall 56 into the transmission chamber 10 and at which the ball bearings are mounted. 26 is rotatably supported (FIG. 2). This ball bearing 26 is used for the outer ring 6.
0, the intermediate wall 5 cannot rotate relatively through the press fit.
6 is arranged on a bearing seat 32 formed by the drive shaft 12 so as to be relatively non-rotatable via a press fit with an inner ring 62. The bearing gap 64 between the outer ring 60 and the inner ring 62 is covered via a ring 66. A pinion 58 is integrally formed at an end of the drive shaft 12 protruding into the transmission chamber 10, and the drive shaft 12 is rotated relative to an intermediate shaft (not shown in detail) of the transmission with the pinion 58. It meshes with an immovable gear.

The pressure compensator 16 of the transmission chamber 10 has a centrifuge component formed by the filter element 20. The filter element 20 is formed by a felt ring and is disposed so as to be relatively non-rotatable with respect to the drive shaft 12 of the drive motor 46 immediately before the ball bearing 26 when viewed in the ventilation direction of the transmission chamber 10. The filter element 20 is held non-rotatably on the drive shaft 12 by an annular holding component 22 with individual holding members 24 extending in the axial direction (FIGS. 2 and 3). The holding component 22 is non-rotatably connected to the drive shaft 12 via a press fit.

The filter element 20 is provided in the gearbox 1
This prevents the lubricant from flowing from 0 to the motor chamber 44 in the ball bearing 26, and also allows pressure compensation. Pressure buildup during operation of the hammer drill in the gearbox chamber 10 due to heating can be reliably prevented. The filter element 20 is pressed toward the outer ring 60 and the inner ring 62 of the ball bearing 26 and the ball bearing 26
The bearing gap between the outer ring 60 and the inner ring 62 is hermetically sealed in the direction of the motor chamber 44. When the hammer drill is operated, the lubricant partially absorbed by the filter element 20 causes the holding member 24 to move due to centrifugal force acting on the filter element 20.
Is returned from the filter element 20 between the notches to the transmission chamber. The filter element 20 is cleaned, so that an advantageous pressure compensation via the filter element 20 is always ensured.

Furthermore, when a pressure compensating passage 36 is provided on the bearing surface of the bearing seat 32 formed by the drive shaft 12, the ball bearing 26 of the drive shaft 12 guarantees the pressure in the transmission chamber 10. Forming part of the lubricant seal 28 of the pressure assurance device 16 which can be used. The pressure compensating passage 36
Are formed by grooves extending beyond the inner ring 62 of the ball bearing 26 in both axial directions. The inner ring 62 of the ball bearing 26 limits the range of the pressure compensating passage 36 to the outside in the radial direction. Instead of the pressure compensating passage, for example, an inner ring 62 of the ball bearing 26 is disposed so as to be relatively non-rotatable on the drive shaft 12 by a sliding fit, thereby forming a gap seal between the drive shaft 12 and the inner ring 62. It is also conceivable that the pressure compensation is realized via the system.

FIG. 4 shows a variant of FIG. 2 with a pressure compensator 18. Almost the same components are denoted by the same reference numerals. Further, for the same features and functions, refer to the description of the embodiment in FIGS. The following description is mainly limited to the differences from the embodiment of FIGS.

The drive shaft 1 of the drive motor instead of the axial groove
4, a pressure compensating passage 38 formed by a thread-shaped recess is provided on a bearing surface of a bearing seat 34 formed by the drive shaft 14. The pressure compensating passage 38 extends in the axial direction beyond the inner ring 62 of the ball bearing 26 provided on the drive shaft 14 and has an annular groove 40 in the motor chamber 44.
It is open to. The pressure compensating passage 38 forms a lubricant seal 30, that is, a labyrinth seal together with the inner ring 62 of the ball bearing 26, and has a function of returning the lubricant to the transmission chamber 10 during operation. I have.

[Brief description of the drawings]

FIG. 1 is a schematic side view of a hammer drill.

FIG. 2 is a cross-sectional view of a portion indicated by reference numeral II in FIG.

FIG. 3 is a view showing a holding component shown in FIG. 2;

FIG. 4 shows a variant of the embodiment shown in FIG. 2 with a thread-shaped pressure compensation passage.

[Explanation of symbols]

10 chambers, 12,14 components, 16,18 pressure compensator, 20 filter elements, 22 holding components, 24 holding members, 26 bearings, 2
8,30 Lubricant seal, 32,34 Bearing seat, 3
6, 38 pressure compensation passage, 40 annular groove, 42 casing, 44 motor chamber, 46 drive motor, 4
8 Tool holder, 50 drill bit, 52, 54
Hand grip, 56 intermediate wall, 58 pinion, 60 outer ring, 62 inner ring,
64 bearing gaps, 66 rings

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Otto Baumann Germany Rheinfelden-E Hitterdingen Weingartenstraße 24 (72) Inventor Rolf Müller Rheinfelden-E Hitteringen Manoskuweast Lasse Germany 76 (72) Inventor Dietmar Sauer Gohmaringen Heinrich-Heine Strasse 16 F-term (reference) 2D058 AA14 BA11 DA49 3C011 FF05 3J042 AA03 BA01 CA10 DA13

Claims (11)

[Claims] 1. A lubricant-containing chamber (1) in which at least one rotationally drivable component (12, 14) is arranged.
0) and a pressure compensating device (16,1) of said chamber (10), comprising at least one centrifuge component which is rotatable.
The machine tool according to (8), wherein the centrifuge component is formed by the filter element (20). 2. A component (12, 14) that can be driven to rotate.
The machine tool according to claim 1, wherein is formed by a motor shaft. 3. The machine tool according to claim 1, wherein the filter element is formed by an annular component. 4. An annular filter element (20),
4. A rotationally drivable component (12, 14) which is non-rotatably held on a rotatable component (12, 14) by an annular retaining component (22) with a separate retaining component (24) extending in the axial direction. Machine tools. 5. The machine tool according to claim 1, wherein the filter element is formed by felt. 6. The filter element (20) comprises a chamber (1).
The component (1) that can be driven to rotate when viewed in the ventilation direction of (0)
2, 14) is disposed immediately before the bearing (26);
The machine tool according to any one of claims 1 to 5. 7. A rotatable driving member (12, 14).
The bearing (26) forms at least a part of a lubricant seal (28, 30) of a pressure compensator (16, 18) capable of compensating for the pressure in the chamber (10). 7. The machine tool according to any one of items 1 to 6. 8. The machine tool according to claim 7, wherein the lubricant seal is arranged as a gap seal between the bearing and the bearing seat. 9. A bearing surface and / or a bearing seat (3) of a bearing.
9. The machine tool according to claim 7, wherein a pressure compensating passage is provided in the bearing surface of the second or third bearing. 10. The machine tool according to claim 9, wherein the pressure compensating passage is formed at least partially by a thread-shaped recess. 11. The pressure compensating passage (38) having at least one
The machine tool according to claim 10, wherein the machine tool is open to two annular grooves.