阅读说明：本技术 具有油箱的装置、吹塑工具以及手持式工具机 (Device with a fuel tank, blow molding tool, and hand-held power tool ) 是由 C·费埃尔 J·纳吉 C·斯穆特克 于 2019-06-21 设计创作，主要内容包括：本发明涉及一种具有油箱(18)的装置,所述装置具有注入接管(24)和用于封闭所述注入接管(24)的封闭盖(22)。本发明提出,设置为用于密封的密封面或端面(54)在所述注入接管(24)和所述封闭盖(22)之间构造迷宫式密封结构(52),所述迷宫式密封结构构造为至少用于使空气进入到所述油箱(18)中并且用于避免油从所述油箱(18)流出。本发明提出一种用于制造所述油箱的吹塑工具。此外,本发明还涉及一种具有所述油箱的手持式工具机。(The invention relates to a device having a fuel tank (18), comprising a filler neck (24) and a closure cap (22) for closing the filler neck (24). According to the invention, a sealing surface or end surface (54) provided for sealing is designed between the filler neck (24) and the closure cap (22) as a labyrinth seal (52) which is designed at least for the purpose of admitting air into the oil tank (18) and for preventing oil from flowing out of the oil tank (18). The invention provides a blow molding tool for manufacturing the fuel tank. The invention further relates to a hand-held power tool having the oil tank.)

1. A device having a tank (18) having a filler neck (24) and a closure cap (22) for closing the filler neck (24), characterized in that a sealing surface or end face (54) provided for sealing forms a labyrinth seal (52) between the filler neck (24) and the closure cap (22), which labyrinth seal is designed at least for the admission of air into the tank (18) and for preventing oil from flowing out of the tank (18).

2. Arrangement with a fuel tank (18) according to claim 1, characterized in that the labyrinth seal (52) is formed by an at least partially encircling groove (58) in an encircling sealing surface or end face (54) of the closure cap (22) and/or of the filler neck (24) and/or in a sealing ring (26) between the closure cap (22) and the fuel tank (18).

3. Device with a fuel tank (18) according to claim 2, characterized in that the groove (58) has an opening (60) on one end radially outside the encircling sealing surface or end face (54) and an opening (62) on the other end radially inside the encircling sealing surface or end face (54).

4. Device with a tank (18) according to claim 2 or 3, characterized in that the groove (58) has an opening (60) on one end towards the outside of the tank (18) and an opening (62) on the other end towards the inside of the tank (18).

5. Arrangement with a fuel tank (18) according to one of claims 2 to 4, characterized in that the groove (58) runs around >180 °, in particular >270 °, preferably >320 ° in the encircling sealing surface or end face (54).

6. Device with a fuel tank (18) according to any one of claims 2 to 5, characterized in that the groove (58) has a depth of 1mm and a width of 0.6 mm.

7. Device with a fuel tank (18) according to one of the preceding claims, characterized in that the closure cap (22) or the filler neck (24) has a multi-start, in particular a two-start, thread (30, 38).

8. Device with a fuel tank (18) according to claim 7, having a filler neck (24) and a closure cap (22) for closing the filler neck (24), characterized in that the threads (32,34,40,42) of the multiple-start thread (30,38) on the closure cap (22) or on the filler neck (24) extend in the circumferential direction at an angle of less than 360 ° divided by the number of threads (32,34,40,42), in particular in the case of a double-start thread (30,38) of less than 180 ° in the circumferential direction.

9. Device with a fuel tank (18) according to any one of the preceding claims, characterized in that the filler neck (24) has a multiple internal thread (30) and the closure cap (22) has a multiple external thread (38).

10. A blow-moulding tool for producing a fuel tank (18) having an internal thread (30) on an injection nozzle (24), characterized in that the blow-moulding tool has the same number of parting planes as the internal threads (32,34) of the fuel tank to be produced, and in that a female thread mould on the blow-moulding tool for producing the injection nozzle (24) extends in the circumferential direction at an angle of less than 360 ° divided by the number of threads (32,34,40, 42).

11. Hand-held power tool (10) having a fuel tank (18) according to one of the preceding claims.

12. Hand-held power tool, in particular a hand-held power tool (10) according to claim 11, having a hand-held power tool housing (11), a fuel tank (18) with an injection nipple (24) and a closure cap (22) for closing the fuel tank (18), characterized in that a sealing ring (26) is provided which serves both for sealing the fuel tank (18) and for sealing a separation gap between the hand-held power tool housing (11) and the fuel tank (18).

13. The hand-held power tool (10) according to claim 12, characterized in that the sealing ring (26) between the hand-held power tool housing (11) and the oil tank (18) is at the same time the sealing ring (26) between the oil tank (18) and the closure cap (22).

14. The hand-held power tool (10) according to any one of claims 11 to 13, characterized in that the hand-held power tool (10) is in the form of a chain saw.

Technical Field

The invention relates to a device having a fuel tank and a blow molding tool for producing the fuel tank. The invention further relates to a hand-held power tool having the oil tank.

Background

Conventional gas tanks for chain saws usually have a filling opening with a closure cap. In addition, a low-pressure valve is usually provided on the tank in order to ensure a pressure equalization in the tank when the liquid level drops and to allow a supplementary inflow of air from outside the tank to the inside of the tank.

From document WO 14082664 a1, a tank for a chain saw is known in which a plurality of axial grooves are provided on the filler neck in order to be able to achieve a pressure equalization when opening or closing the tank.

Disclosure of Invention

The invention is based on a device having a fuel tank, wherein the device has a filler neck and a closure cap for closing the filler neck. According to the invention, the sealing surface, in particular the front surface, provided for sealing, has a labyrinth seal between the tank, in particular the filler neck and the closure cap of the tank, at least for the purpose of admitting air into the tank and for the purpose of preventing oil from flowing out of the tank. This function can be achieved in the closed state of the closure cap, i.e. when the closure cap closes the filler neck. Furthermore, this function is ensured during operation, storage and/or transport. I.e. no oil flows out, at least in normal use. The closure cap can be screwed to the filler neck of the tank by means of a thread, but other connection methods are also conceivable, for example by means of form-locking or force-locking elements, for example by means of a hoop element, a clamping device or the like. In an advantageous manner, an additional vent valve on the tank or alternatively a valve integrated into the closure cap can be dispensed with. This improves reliability and reduces cost because no separate components are required.

It is also proposed that the labyrinth seal is formed by an at least partially circumferential groove in the circumferential sealing surface or end face of the closure cap and/or of the tank and/or of the filler neck and/or in the sealing ring between the closure cap and the tank. The sealing surface or end face can in particular be arranged on a flange of the respective element. The sealing surface or end face is provided for contacting, in particular pressing, the sealing surface or end face of the filler neck and/or of the sealing part in the closed state. The term "closed state" is understood to mean a state in which it is completely screwed into the tank or the filler neck (see also the above definition). The groove is curved, in particular circular-arc-shaped. The labyrinth is realized by a circumferential groove. The slot prevents viscous oil from flowing completely through the slot, and instead, gaseous air can pass through the slot. The air flow volume/velocity can be influenced by the choice of slot geometry.

It is also proposed that the groove has an opening on one end radially outside the circumferential end face and an opening on the other end radially inside the circumferential end face. The groove is thus open to the inside and outside of the fuel tank in the closed state of the filler neck. As already mentioned, a separate valve on the tank can thus be dispensed with in a simple manner.

Furthermore, it is proposed that the groove runs around >180 °, in particular around >270 °, preferably around >320 °, in the circumferential sealing surface or end surface. The filler neck, the seal and the closure cap are advantageously round. A force-fit is produced between the filler neck and the closure cap on the sealing surface or end face by: the corresponding thread is screwed to the filler neck and the closure cap. With the circumferential groove, in particular when the filler neck or the closure cap is arranged horizontally on the hand-held power tool or the hand-held power tool housing, the oil is made difficult to flow out by: the oil must rise up the channels or grooves against gravity. A "horizontal arrangement" is to be understood as an arrangement in which the center axis of the filler neck or the screw axis of the closure cap does not extend vertically, but rather substantially horizontally, relative to the base receiving surface of the hand-held power tool. A base support surface is to be understood to be a surface on which the hand-held power tool is usually placed or used during operation. Horizontal here means parallel to the ground surface.

The groove may have a depth of, for example, 1mm and a width of 0.6 mm. This prevents the outflow of oil from the hand-held power tool, but allows the inflow of air and enables the oil tank to be drained without back pressure. Thus, the oil transfer pump does not create a vacuum in the oil tank, which would impede oil transfer to the pump, at least as long as the other components involved in oil transfer are functioning properly.

Furthermore, it is proposed that the closure cap or the filler neck have a multi-start thread, in particular a double-start thread. Thus, overloading of the injection nozzle can be avoided. The larger the lift is, the smaller the tightening force proportional to the torque is relatively. Furthermore, the force is distributed over a plurality of spirals. The sealing surfaces are more evenly loaded by the force. Furthermore, the distance over which the air must travel at pressure equilibrium is shorter (not along a long spiral in the circumferential direction). The closing time or the angle of rotation for completely closing the closure cap is reduced, since the multiple start thread generally has a greater lift. The closure cap can be screwed directly onto or into the filler neck at several points or in several angular positions.

The invention proposes that the threads of the multiple-thread on the closure cap or the filler neck extend in the circumferential direction at an angle of less than 360 DEG divided by the number of threads, in particular at an angle of less than 180 DEG in the case of a double-thread. In this way, even when the closure cap is screwed in (because a certain clearance is provided in the radial direction between the threads of the closure cap and the filler neck), a direct connection is formed between the threads in the axial direction parallel to the screw axis. The pressure equalization can be performed with less resistance. Furthermore, however, a gap or free surface is also formed between the spirals, viewed in the circumferential direction. Advantageously, there is no high tolerance requirement for this free surface. In contrast, the thread on the filler neck or the closure cap has a much smaller tolerance. Thus, for example, during manufacture, the tool can accurately fix the fuel tank on this free surface. Advantageously, the gap region comprises a parting line or parting plane of the tool or of the blow-moulding tool. The production process, in particular the blow molding process, can be simplified by the low quality requirements for the free surface without spirals. Eliminating finishing and saving cost.

The invention proposes that the filler neck has a multi-start internal thread and the closure cap has a multi-start external thread. The end face of the closure cap can thereby be pressed against the seal or sealing surface on the filler neck on the flange of the closure cap. However, the seal may also seal the housing of the hand-held power tool radially with respect to the filler neck. Thus, even when oil is spilled, for example when oil is introduced into a tank, no oil can enter the hand-held power tool housing. The oil does not flow into the gap or slot between the oil tank and the hand-held power tool housing, but rather flows either into the oil tank or on the outside onto the hand-held power tool housing. There, the oil can be absorbed easily, for example, with a rag.

The invention relates to a blow molding tool for producing a fuel tank which has an internal thread on an injection nozzle. Wherein the blow tool has the same number of parting surfaces as the internal spirals of the tank to be produced and the female spiral mold on the blow tool for producing the filler neck extends in the circumferential direction at an angle of less than 360 ° divided by the number of spirals.

Furthermore, the invention claims a process for blow-moulding a tank with an internal thread on an injection nozzle, comprising at least the following steps: the tool fixes the filler neck between the threads on the inner circumferential surface of the filler neck, in particular at least at points spaced apart from one another by an angle of 360 ° divided by the multiple linearity of the threads, in particular depending on the multiple linearity of the internal thread to be produced.

Furthermore, the invention relates to a hand-held power tool having the aforementioned fuel tank.

The invention furthermore relates to a hand-held power tool, in particular the hand-held power tool described above, having a hand-held power tool housing, a fuel tank with an injection nozzle, and a closure cap for closing the fuel tank, wherein a sealing ring is provided both for sealing the fuel tank and for sealing a separation gap between the hand-held power tool housing and the fuel tank.

Furthermore, the hand-held power tool has a sealing ring between the hand-held power tool housing and the oil tank, in particular wherein the sealing ring is at the same time a sealing ring between the oil tank and the closure cap. The sealing ring thus seals radially between the hand-held power tool housing and the oil tank or its filler neck and prevents oil from penetrating into the hand-held power tool housing. However, if the closure cap is screwed on, the sealing ring also seals the tank with respect to the outflow of oil to the outside of the tank.

Drawings

Further advantages are obtained from the following description of the figures. The figures, description and claims contain many combinations of features. Those skilled in the art may also consider these features individually and combine them into meaningful other combinations, as the purpose may be.

The figures show:

fig. 1 shows a part of a hand-held power tool in the form of a chainsaw or a chainsaw housing;

FIG. 2 is a cross-sectional view of a portion of a chainsaw or chainsaw housing having a fuel tank;

FIG. 3 is a perspective view of the closure;

FIG. 4 is a top view of the closure cap according to FIG. 3;

FIG. 5 a portion of a fuel tank with a filler neck;

fig. 6 shows an alternative chain saw.

Detailed Description

Fig. 1 shows a part of a hand-held power tool in the form of a chainsaw 10 or a chainsaw housing 11. Hiding the blade and saw chain. The hand-held power tool has a first and a second handle 12,14, by means of which the hand-held power tool can be gripped or guided. A motor, not shown, which is usually arranged in the chainsaw housing 11 can be activated by means of at least one switch 16. For supplying the saw chain, not shown, with lubricating oil, the hand-held power tool has a tank 18, for which only a level indicator 20 is visible here. The closure cap 22 closes a filler neck 24 (see fig. 2), not shown here, of the fuel tank 18. The closure flap 22 or the filler neck 24 is arranged horizontally (laterally) on the chainsaw housing 11. I.e. the opening or filler neck 24 points in the lateral direction. In principle, however, the filler neck 24 can also be vertically oriented, in particular in the upper region of the chain saw 10 (see fig. 6). The liquid level of the tank 18 can be located above at least one lower or intermediate region of the closure flap 22 or of the filler neck 24 located behind it (provided that the liquid level indicator indicates a liquid level from empty to full in its extent) as indicated by the extent of the liquid level indicator 20 which is arranged substantially vertically on the chainsaw housing. In principle, the invention is of course also applicable to other hand-held power tools, in particular those with continuous oil lubrication of the cutting elements or cutting strands. In such hand-held power tools, the fluid level generally drops during operation, so that a vacuum is formed in the oil tank, so that if the oil is to be transported with little resistance, the inflowing air must be replenished.

Fig. 2 shows a partial sectional view of the chainsaw 10 or the chainsaw housing 11 of fig. 1 in a substantially horizontal section (through the cover 22). At least the fuel tank 18, its filler neck 24, the seal (in particular the sealing ring 26) and the closure cap 22 are cut open. Furthermore, the closure cap stopper 28, the chainsaw housing 11, the liquid level indicator 20 and possibly other elements are at least partially broken away. The oil tank 18 (see also fig. 5 for this purpose) has an internal thread 30 in the region of the filler neck 24 or the filling opening 36, which has two threads 32, 34. The lift of a multiple start thread is greater than in the single start thread case. Thus, the transmission ratio is larger (more axial movement per relative rotation). With a defined rotational tightening force, the axial force acting on the spiral is smaller due to the greater lift. As a result, overloading of the thread is less likely to occur when the thread is tightened, which makes the fuel tank 18 or its permanent closure by means of the closure cap 22 more robust. The internal thread 30 or the filler neck 24 is not easily deformed, and the closure quality is maintained. The outflow opening is not shown here, but is formed separately from the filling opening 36, in particular in the lower part or near the bottom of the tank 18. The closure cap 22 has external threads 38. The external thread also has two threads 40,42 or is designed as a multiple thread. The tolerances of the internal thread 30 of the filler neck 24 are relatively coarse. However, the tolerance of the "female" form of the internal thread 30 on the outside of the filler neck is narrow. This is because the semi-finished product or tank 18 is held during the manufacturing process (here blow moulding) from the outside by a tool (which always has the same/exact geometry), whereas the internal geometry may differ slightly depending on the blow moulding process. The "negative" or notch 44 of the internal thread 30 and the otherwise smooth, round outer side 46 of the filler neck 24 are advantageously used for fixing and positioning the fuel tank 18 in the chainsaw housing 11 or in the hand-held power tool. For this purpose, at least one form-locking element, in particular one or more latching projections 48, is provided on the chainsaw housing. By means of the smooth and round outer side 46 and the latching projection 48, the oil tank 18 can be positioned and/or fixed very precisely on the chainsaw housing 11. The oil tank can be clamped completely to the chainsaw housing 11, which is ensured by the bevel on the detent projection 48. The distance a in the separating gap 70 between the filler neck 24 and the wall 50 of the chainsaw housing 11 is thus very precisely defined and can be used as a sealing surface for the sealing element or sealing ring 26. This prevents oil which escapes between the filler neck 24 and the chain saw housing 11, for example, during filling of the oil tank 18, from penetrating into the chain saw housing. This reduces the risk of contamination, avoiding possible accidental contamination due to oil spilling "subsequently/accidentally" from the chainsaw housing 11. The customer satisfaction and the safety are improved. Conversely, excess or spilled oil can be easily seen and/or wiped off or absorbed on the outside of the chainsaw housing 11 or on the surface of the chainsaw 10. Furthermore, the internal structure of the chainsaw 10 is also kept clean and thus the reliability of the implement is improved. However, no additional sealing element is required between the chainsaw housing 11 and the filler neck 24 to achieve this function, since only a sealing element or sealing ring 26 is used, which also serves to seal the oil tank 18.

The selective (air-in, but oil-out) sealing or labyrinth seal 52 of the oil tank 18, or in other words the selective sealing between the filling opening 36 or the filler neck 24 and the closure cap 22, is effected as follows:

the closure cap 22 (see in particular fig. 3 and 4 for this purpose) has an end face 54 which is provided for sealing. Which is arranged on the flange 56 of the closure cap. The labyrinth seal 52 is machined into this end face 54 or into an axial end face (axial with respect to the screwing direction or the tightening direction) or into a flange 56. The labyrinth seal 5 allows air to enter the oil tank 18 and serves to prevent oil from flowing out of the oil tank 18. The labyrinth seal 52 is formed by an at least partially circumferential groove 58. The groove is machined into the circumferential end face 54 or into the flange 56. The groove 58 has an opening 60 at one end radially outward of the circumferential end face 54 or the flange 56. The groove 58 has an opening 62 at the other end, radially inward of the circumferential end face 54 or the flange 56. Thus, there is no direct line-of-sight connection between the outer opening 60 and the inner opening 62. The groove 58 advantageously runs around >180 °, in particular around >270 °, preferably around >320 °, in the circumferential end face 54 or flange 56. According to fig. 3, the groove 58 almost surrounds 360 °. The groove 58 can also be helically wound in the end face 54 or the flange 56 and provide a smooth transition to the outside and the inside of the closure cap 22. However, in the present case, the groove 58 is circular. Between the outer opening 60 and the inner opening 62, the wall bearing the end face 54 extends almost as far as the dividing strip 64. The depth of the groove 58 (inwardly towards the end face) is about 1 mm. The width of the slot 58 (in the radial direction as seen from the axis of rotation of the closure cap 22) is about 0.6 mm. The circumferential length or angle of the groove 58, the ratio of its depth and width, can vary, in particular in relation to the desired viscosity of the filling medium or oil which is to be filled into the oil tank 18. Air is admitted in particular when the level of the tank drops and/or in order to avoid a vacuum being formed in the tank. Furthermore, oil run-off is avoided. The viscosity of the oil inhibits the oil from slowly passing through either labyrinth seal 52 or groove 58. By the formation of a liquid level or vacuum which falls during operation, the oil which accumulates in labyrinth seal 52 or in recess 58 is sucked into oil tank 18. As a result, oil remaining on the end face 54 or in the region of the filling opening 36 (for example during filling of the oil tank 18) is also sucked into the oil tank 18. The sealing ring 26 is advantageously designed, in particular with a rectangular or square cross section, in such a way that it is used at least for increased sealing of its radial and/or axial contact surface with respect to the chainsaw housing 11 or the filler neck 24 by means of a force or pressure exerted on it when the closure flap 22 is closed. The oil tank 18 is therefore sometimes additionally fastened to the chainsaw housing 11 by the closure cap 22 and/or advantageously forms a seal not only between the closure cap 22 and the filler neck 24 at the axial end face 54 or at the axial contact face but also radially and/or axially relative to the filler neck 24, the chainsaw housing 11 and/or the closure cap 22.

Fig. 5 shows a detail of the oil tank 18 with the filler neck 24. The two spirals 32,34 of the internal thread 30 extend less than 180. Between which a helical gap or smooth and/or tolerance-loaded filler neck 66 opens to some extent. The helical clearance comprises a parting plane of the blow tool when manufacturing the fuel tank 18. Due to the double or multiple linearity of the internal thread 30, which extends in the circumferential direction at an angle of at most 360 ° divided by the number of threads, there is a lower tolerance requirement for the blow-moulding tool than in the case of an internal thread 30 which extends beyond the tool parting plane. Thereby saving costs in tooling or manufacturing. Simple demoulding can be realized. However, an axial clearance (in the screwing-in direction) or a direct connection without thread obstruction is also formed between the threads 32,34, even if the closure cap 22 is screwed on or in. Pressure equalization between the inside and the outside of the fuel tank 18 can thereby be achieved with little resistance. In principle, the thread 30 can also have another number of threads 32, 34. Advantageously, these threads also have "gaps" or free or smooth faces between the threads in the circumferential direction. This is ensured by the fact that the spirals extend in the circumferential direction at an angle smaller than 360 deg. divided by the number of spirals.

In principle, the labyrinth seal 52 can be formed in particular by an at least partially circumferential groove 58 in the sealing element or sealing ring 26, in particular in the circumferential end face of the flange 56, of the tank 18 and/or of the closure cap 22 and/or between the tank 18 and the closure cap 22. The principle can therefore also be applied to filler necks having an external thread or to fuel tanks which have no seal between the closure cap and the filler opening or filler neck, but sometimes only have an adjacent end face. By means of the labyrinth arrangement between two adjacent elements, for example the closure cap and the sealing ring and/or the sealing ring and the filler neck or the filler neck and the closure cap, the passage of air can be influenced, in particular variably influenced, depending on the closed position or the screwed-on position of the adjacent seals relative to one another, in particular depending on the screwed-on position or the closed position.

FIG. 6 shows an alternative chain saw 10 having a closure cover on the upper side of the chain saw 10. Here too, a correspondingly vertically arranged oil tank 18 with a closure cap 22 and a labyrinth seal 52 and/or with a sealing ring 26 can be used, which prevents oil from escaping into the chainsaw housing and at the same time seals the oil tank. Further, the chainsaw 10 also shows a chain 72 arranged for swinging over the blade.