专利汇可以提供Manually operated tool专利检索，专利查询，专利分析的服务。并且A manually operated implement such as a chainsaw, parting-off grinder or similar device is provided and has an internal combustion engine to drive a tool, an air cleaning unit and a tank housing. The tank housing is a cast part and a fuel tank is located in the tank housing. A simple, advantageous design of the tank housing is achieved when at least one housing part of the air cleaning unit is formed on the tank housing.，下面是Manually operated tool专利的具体信息内容。
The invention relates to a manually operated tool such as a chain saw, parting-off grinder or similar device.
A parting-off grinder having a tank housing which comprises a fuel tank and an equalizing reservoir is known from DE 44 27 738 A1. An air filter is provided as an air cleaning unit. The fuel tank itself forms one housing wall of the parting-off grinder. The air filter is positioned in the housing.
The object of the invention is to create a tool of the aforementioned general type which is of simple design.
This object is achieved by means of a tool or implement having an internal combustion engine for driving a tool, and comprising an air cleaning unit and a tank housing, wherein the tank housing is a cast part, wherein a fuel tank is formed in the tank housing, and wherein at least one housing part of the air cleaning unit is formed on the tank housing.
The forming of a housing part of the air cleaning unit on the tank housing permits the number of individual parts in the tool to be reduced. At the same time the total weight of the tool can be considerably reduced thanks to the savings in material. This also simplifies the operation of the tool.
The air cleaning unit advantageously comprises a cyclone unit with at least one cyclone tube, part of which at least is designed as one piece with the tank housing. In this arrangement the cyclone tube advantageously lies along the longitudinal axis of the tool and passes at least partially through the tank housing. The arrangement of the cyclone tubes along the tool results in a compact design of tank housing and air cleaning unit. The air cleaning unit advantageously comprises an air filter unit with a housing which is designed at least partially as one piece with the tank housing. In this arrangement the air filter base of the air filter unit is formed onto the tank housing. This obviates the need for an additional housing wall between the air filter and the tank housing. At the same time, the size can be reduced as spaces between the components are rendered redundant due to the one-piece design.
The tank housing expediently comprises two molded shells which are connected to one another in a parting plane at right angles to the longitudinal axis of the tool. The division of the tank housing at right angles to the longitudinal axis of the tool, in particular perpendicular to the longitudinal axis of the tool, means that the connecting seam between the two molded shells is shorter than if it were divided along the longitudinal axis of the tool. This ensures adequate strength even with the thin tank housing wall thicknesses required to achieve a low weight. By dividing the tank housing at right angles it is possible to integrate the cyclone tubes and the air filter base simply without the need for cores for the manufacture of the tank housing in a casting process. The two molded shells are expediently connected together by means of welding.
Provision is made for the integration of an equalizing reservoir into the tank housing. The equalizing reservoir equalizes the volume in the tank. The equalizing reservoir is connected to the fuel tank via an equalizing line which runs particularly in the parting plane of the two molded shells. The arrangement of the equalizing line in the parting plane makes for a simple manufacturing process, the equalizing line particularly being integrated in the two molded shells and thus manufactured in one piece with them. If the two molded shells of the tank housing are connected by means of ultrasound welding, the equalizing line can also be welded at the same time. In this arrangement small leaks in the equalizing line are insignificant in terms of the leakproofness of the overall system since the equalizing line runs entirely within the tank housing and fuel is therefore only able to leak into the fuel tank or the equalizing reservoir. A throttle for regulating the flow cross-section in the equalizing line is advantageously positioned in the equalizing line. The throttle is advantageously accessible from the tank connector and can therefore be adjusted simply. The throttle is expediently a grub screw or setscrew.
A bleed line is run from the equalizing reservoir to a bleed or venting opening. The bleed line is expediently integrated into the molded shells and advantageously also runs inside the tank housing such that the bleed line can be manufactured together with the molded shells and welded to them in one work cycle. A bleed valve is advantageously positioned in the bleed opening. The bleed opening is particularly positioned in the air filter base so that air and any fuel being carried with it is able to pass out of the equalizing reservoir directly to the clean side of the air filter and from there into the intake duct. This prevents any fuel from escaping. At the same time, the fuel carried away via the bleed line is fed to the internal combustion engine. The forming of the air filter base onto the tank housing avoids the need for sealing points on the outside of the tank housing and ensures that even if the bleed valve is not completely sealed it is impossible for fuel to leak out.
The tank housing is advantageously a load-bearing housing part of the tool. This obviates the need for further components which might otherwise form a load-bearing structure. The tank housing is particularly made of plastic.
Embodiments of the invention are explained below with reference to the drawing, in which:
FIGS. 3/4 show perspective views of a first molded shell of the tank housing;
FIGS. 5/6 show perspective views of a second molded shell of the tank housing;
The air cleaning unit comprises an air filter unit 8 with a pre-filter 30 which is positioned in a cover 33, a main filter 31 in an air filter housing 34 and a fine filter 32 which is positioned between the main filter and the air filter base 21. Instead of the pre-filter 30 it is also possible to provide a cyclone unit. A peripheral seal 35 is held between the air filter housing 34 and the air filter base 21. The air filter base 21 is formed onto the tank housing 10. The tank housing 10 and the clean side of the air filter unit 8 are thus separated only by the air filter base 21.
The tank housing 10 is formed of a first molded or partial shell 24 and a second molded or partial shell 25. The parting plane 36 between the two molded shells 24, 25 runs in a plane perpendicular to the longitudinal axis 16 of the tool. Located in the tank housing 10 is a fuel tank 12 which is bounded partially by the first and partially by the second molded shell.
Located in the tank housing 10 are a fuel tank 12 and an equalizing reservoir 13. In this arrangement, the equalizing reservoir extends in the area of the cyclone tubes 19 which pass through the equalizing reservoir 13 of the tank 10. The return 20 also passes through the equalizing reservoir 13. The fuel tank 12 and the equalizing reservoir 13 are separated from one another by a lateral wall 56 which runs approximately along the longitudinal axis 16 of the parting-off grinder 1. The fuel tank 12 and the equalizing reservoir 13 are connected to one another via an equalizing line 38. The equalizing line 38 has an inlet (not illustrated) in the area 57 at the roof 55 of the tank housing 10. The equalizing line 38 passes first towards the roof 55 and then in the opposite direction towards the base 53 thereby forming a labyrinth-like deviation. The equalizing line 38 then runs along the roof 55, the lateral wall 56 and the base 53 until it flows into a outlet 58 in the area of the base 53 of the tank housing 10 in the equalizing reservoir 13. The equalizing line 38 runs in the parting plane 36 of the two molded shells 24 and 25, the equalizing line 38 being formed onto both molded shells 24 and 25. In the area of the lateral wall 56 the equalizing line 38 runs between the fuel tank 12 and the cyclone tubes 19. Pressure can be equalised between the fuel tank and the equalizing reservoir 13 via the equalizing line 38. The labyrinth-like arrangement of the equalizing line 38 largely prevents fuel from entering the equalizing reservoir 13. Nevertheless, should fuel enter the equalizing reservoir 13, it collects in the area of the base 53 in the equalizing reservoir 13 and is returned to the fuel tank 12 during the operation of the parting-off grinder 1.
Positioned in the area of the roof 55 is a bleed line 42 which flows into an inlet 59 in the equalizing reservoir 13 (
As shown in
The fact that the equalizing line 38, the bleed line 42 and the bleed opening 43 are integrated into the tank housing 10 prevents leaks to the outside. The tank housing 10 may be produced simply using a casting process and, where it is made of plastic, particularly using an injection moulding process. In this case, parts of the air cleaning unit and all connecting lines can also be produced in the same work cycle. The two molded shell 24 and 25 are advantageously welded, fused or heat sealed together, if the tank housing 10 is made of plastic in particular by means of ultrasound welding. All the connecting lines are made in one work cycle. To check the leakproofness of the tank housing it is possible to integrate a diagnostics connection for checking tank integrity in the tank connector. A tank housing as disclosed in the invention is particularly useful for use in parting-off grinders but can also advantageously be employed in chainsaws and other manually operated tools.
The specification incorporates by reference the disclosure of German priority document 103 22 640.0 filed May 20, 2003.
The present invention is, of course, in no way restricted to the specific disclosure of the specification and drawings, but also encompasses any modifications within the scope of the appended claims.