Hydraulic assembly of a forklift truck

Abstract

Hydraulic assembly (1) of a forklift truck, comprising a pressure medium reservoir (2) and hydraulic components (3a-3f), wherein the hydraulic assembly (1) comprises a hydraulic component holder (5) to which the hydraulic components (3a-3f) are attached, characterized in that the hydraulic component holder (5) is elastically attached to the pressure medium reservoir (2), wherein the hydraulic assembly (1) formed by the pressure medium reservoir (2) and the hydraulic component holder (5), which is elastically attached to the pressure medium reservoir (2) and to which the hydraulic components (3a-3f) are attached, is designed as a pre-assembly unit (10) that can be installed in the forklift truck during assembly, wherein a three-point mounting (11) is provided for the elastic attachment of the hydraulic component holder (5) to the pressure medium reservoir (2), wherein each attachment point (11a, 11b,11c) the three-point mounting (11) has an elastic decoupling element (12a, 12b, 12c) arranged between the pressure medium reservoir (2) and the hydraulic component holder (5), wherein the hydraulic component holder (5) has a strut (5a, 5b, 5c) for each mounting point (11a, 11b, 11c) on which an elastic decoupling element (12a, 12b, 12c) can be attached, and the pressure medium reservoir (2) has a receptacle (2a, 2b, 2c) for each mounting point (11a, 11b, 11c), each of which receives a strut (5a, 5b, 5c) of the hydraulic component holder (5) provided with the elastic decoupling element (12a, 12b, 12c).

Description

[0001] The invention relates to a hydraulic assembly of a forklift truck comprising a pressure medium reservoir and hydraulic components, wherein the hydraulic assembly includes a hydraulic component holder to which the hydraulic components are attached.

[0002] In industrial trucks, it is known to attach hydraulic components, which include, for example, at least one valve and / or at least one filter and / or at least one hydraulic accumulator, to corresponding hydraulic component holders. These hydraulic component holders can be elastically mounted within the industrial truck to decouple the hydraulic component from vibration and noise.

[0003] During the assembly of the industrial truck, it is known to mount the pressure medium reservoir and the hydraulic component holders in the truck and then mount the hydraulic components onto the corresponding hydraulic component holders. It is also known to mount the hydraulic component onto the corresponding hydraulic component holder before installing the hydraulic component holder in the industrial truck. However, a separate hydraulic component holder is provided for each hydraulic component, meaning that multiple hydraulic component holders must be installed in the industrial truck for multiple hydraulic components.

[0004] This results in numerous assembly steps on the main assembly line of the industrial truck, leading to a long assembly time for the hydraulic assembly formed by the pressure medium reservoir and hydraulic components. These disadvantages are further exacerbated if different industrial trucks are built on the main assembly line, differing in the number of hydraulic components to be assembled.

[0005] A generic hydraulic unit of an industrial truck with the features of the preamble of claim 1 is known from DE 10 2004 032 256 B3.

[0006] DE 10 2007 062 017 A1 discloses a multifunctional industrial truck.

[0007] DE 10 2004 030 560 A1 discloses a forklift truck with a pressure medium reservoir for a hydraulic system, in which a cooling device is integrated.

[0008] The present invention is based on the objective of providing a hydraulic assembly for a forklift truck of the type mentioned above, which enables the forklift truck to be assembled on the main assembly line with a reduced assembly time.

[0009] This problem is solved according to the invention by elastically attaching the hydraulic component carrier to the pressure medium reservoir, wherein the hydraulic assembly formed by the pressure medium reservoir and the hydraulic component holder, which is elastically attached to the pressure medium reservoir and to which the hydraulic components are attached, is designed as a pre-assembled unit that can be installed in the industrial truck during assembly, wherein a three-point mounting is provided for elastically attaching the hydraulic component holder to the pressure medium reservoir, wherein each mounting point of the three-point mounting has an elastic decoupling element arranged between the pressure medium reservoir and the hydraulic component holder, and wherein the hydraulic component holder has a strut for each mounting point.an elastic decoupling element can be attached to the hydraulic component holder, and the pressure medium reservoir has a receptacle for each mounting point, each of which receives a strut of the hydraulic component holder equipped with the elastic decoupling element. According to the invention, only a single, and therefore common, hydraulic component holder is provided for the hydraulic components, to which the hydraulic components can be attached. Furthermore, according to the invention, the hydraulic component holder equipped with the hydraulic components is elastically attached to the pressure medium reservoir for vibration and acoustic decoupling before the pressure medium reservoir is installed in the industrial truck. The hydraulic assembly, which consists of the pressure medium reservoir, the hydraulic component holder elastically attached to the pressure medium reservoir, and the hydraulic components arranged on the hydraulic component holder, thus forms a pre-assembly unit.The hydraulic assembly, consisting of the pressure reservoir, the hydraulic component holder elastically attached to the reservoir, and the hydraulic components arranged on the holder, is installed as a complete unit on the main assembly line. This pre-assembly unit can be pre-installed at pre-assembly workstations. This reduces the assembly time of the forklift on the main assembly line, as vehicle-specific assembly steps can be shifted from the main assembly line to pre-assembly workstations. Furthermore, it minimizes the assembly work on the forklift itself on the main assembly line, which is often ergonomically unfavorable due to poor accessibility. Additionally, the pre-assembled hydraulic assembly makes it easier to...To assemble different industrial trucks and different series of industrial trucks with different hydraulic assemblies on a main assembly line – a so-called mixed assembly – because the installation of the hydraulic assembly designed as a pre-assembly unit has essentially the same assembly times on the main assembly line, although the assembly time of the different hydraulic assemblies, each designed as a pre-assembly unit and carried out at pre-assembly workstations, can differ significantly.

[0010] Particular advantages arise when, according to a further development of the invention, the hydraulic assembly designed as a pre-assembly unit is provided with hoses or pipes for the hydraulic components before installation in the industrial truck. This allows the assembly time on the main assembly line to be further reduced, since the pre-assembly unit is already partially or completely equipped with hoses or pipes for the hydraulic components.

[0011] According to the invention, a three-point mounting is provided for the elastic attachment of the hydraulic component holder to the pressure medium reservoir, wherein each mounting point of the three-point mounting has an elastic decoupling element arranged between the pressure medium reservoir and the hydraulic component holder. This allows for an elastic attachment of the hydraulic component holder to the pressure medium reservoir with minimal construction effort, thus enabling vibration and acoustic decoupling of the hydraulic components.

[0012] According to the invention, the hydraulic component holder has a strut for each mounting point onto which an elastic decoupling element, in particular a geometrically matched absorber plug, can be attached. This allows an elastic decoupling element to be provided at each mounting point between the pressure medium reservoir and the hydraulic component holder with minimal construction effort. The elastic decoupling element can, for example, be designed as a rubber plug, which can be cylindrical or rectangular.

[0013] According to the invention, the pressure vessel has a receptacle for each mounting point, each of which receives a strut of the hydraulic component holder provided with the elastic decoupling element. This allows the mounting points of the three-point bracket, which receive the struts of the hydraulic component holder provided with the elastic decoupling elements, to be formed on the pressure vessel with minimal construction effort.

[0014] Advantageously, two of the receptacles are designed as pocket-like receptacles, each open on one side and another side, in particular a top or an inclined front, and the third receptacle is designed as a U-shaped receptacle that is open at the front. This allows for simple and quick mounting of the hydraulic component holder to the pressure medium reservoir, since the hydraulic component holder, with the corresponding struts and decoupling elements, can be easily placed into the two upwardly open or inclined upwardly open pocket-like receptacles and then pivoted into the U-shaped receptacle that is open at the front.

[0015] A particularly advantageous feature is the ability to attach a locking device to the third mounting point, which allows the front of the U-shaped mounting to be closed. This positions the strut, equipped with the elastic decoupling element, between the U-shaped mounting and the locking device. Such a locking device enables the hydraulic component holder to be easily attached to the U-shaped mounting.

[0016] According to an advantageous embodiment of the invention, the securing device is designed as a retaining plate that can be attached to the pressure medium reservoir by means of a screw connection. Such a securing device is easy to manufacture and quick to assemble in order to attach the hydraulic component holder to the pressure medium reservoir.

[0017] According to an advantageous embodiment of the invention, the hydraulic assembly according to the invention is assembled at a pre-assembly workstation into the pre-assembly unit, and the pre-assembly unit is installed in the industrial truck on a main assembly line. This makes it possible to achieve a reduced assembly time for the industrial truck on the main assembly line, since vehicle-specific or vehicle series-specific assembly steps for the hydraulic assembly are shifted from the main assembly line of the industrial truck to pre-assembly workstations.

[0018] According to an advantageous embodiment of the invention, the hydraulic components attached to the hydraulic component holder comprise one or more of the following components: - a control directional valve, - a brake valve, - a valve, - a filter, - a hydraulic accumulator.

[0019] Further advantages and details of the invention are explained in more detail with reference to the exemplary embodiment shown in the schematic figures. Here, Fig. 1 a first embodiment of a hydraulic assembly according to the invention for a forklift truck in a perspective view, Fig. 2 the pressure medium reservoir of the hydraulic assembly Fig. 1 in a perspective view, Fig. 3 the hydraulic component holder equipped with the hydraulic components Fig. 1 in a front view, Fig. 4 the hydraulic component holder of the Fig. 3 in a view of the reverse side, Fig. 5 a second embodiment of a hydraulic assembly according to the invention for a forklift truck in a perspective view, Fig. 6 the pressure medium reservoir of the hydraulic assembly Fig. 5 in a perspective view, Fig. 7 the hydraulic component holder equipped with the hydraulic components Fig. 5 in a front view, Fig. 8 the hydraulic component holder of the Fig. 7 in a view of the reverse and Fig. 9 the hydraulic assembly of the Fig. 5 with additional hoses and piping for the hydraulic components.

[0020] In the Fig. Figure 1 shows a first embodiment of a hydraulic assembly 1 of a forklift truck according to the invention, comprising a pressure medium reservoir 2 and hydraulic components 3. In this embodiment, the hydraulic components 3 comprise... Fig. 1 several valves 3a, 3b. In the exemplary embodiment, the hydraulic component 3 is the Fig. 1. At least one filter 3c, 3d is provided, in the illustrated embodiment two filters 3c, 3d.

[0021] The valves 3a are in the illustrated embodiment of the Fig. 1. Valve 3b is configured as several control directional control valves of a work hydraulic system of the industrial truck, arranged in a control directional control valve block. Valve 3b is configured as a hydraulic brake valve of a braking system of the industrial truck. Filters 3c and 3d are configured as high-pressure and low-pressure filters, respectively.

[0022] In the Fig. Figure 5 shows a second embodiment of a hydraulic assembly 1 of a forklift truck according to the invention, comprising a pressure medium reservoir 2 and hydraulic components 3. In this embodiment, the hydraulic components 3 comprise... Fig. 5 several valves 3a, 3b, 3e. In the exemplary embodiment, the hydraulic component 3 is the Fig. 5. A hydraulic accumulator 3f is also provided.

[0023] The valves 3a are in the illustrated embodiment of the Fig. Valve 5 is configured as several control directional control valves of a work hydraulic system of the industrial truck, arranged in a control directional control valve block. Valve 3b is configured as a hydraulic brake valve of a braking system of the industrial truck. Valve 3e controls a component not shown in detail. The hydraulic accumulator 3f serves to store pressurized hydraulic fluid.

[0024] The hydraulic assembly 1 of the Fig. 1 and the Fig. 5 further includes a hydraulic component holder 5 to which the hydraulic components 3a-3f can be attached.

[0025] The hydraulic component holder 5 can be elastically attached to the pressure medium reservoir 2 for vibration and acoustic decoupling of the hydraulic components 3a-3f.

[0026] According to the invention, the hydraulic assembly 1, which is formed by the pressure medium reservoir 2 and the hydraulic component holder 5, which is elastically attached to the pressure medium reservoir 2 and to which the hydraulic components 3a-3f are attached, is designed as a pre-assembly unit 10, which can be installed and mounted as a whole unit in the industrial truck during assembly.

[0027] For the elastic attachment of the hydraulic component holder 5 to the pressure medium reservoir 2, a three-point mounting 11 with three attachment points 11a, 11b, 11c is provided, wherein each attachment point 11a, 11b, 11c of the three-point mounting 11 has an elastic decoupling element 12a, 12b, 12c arranged between the pressure medium reservoir 2 and the hydraulic component holder 5.

[0028] The hydraulic component holder 5 has - as shown in the Fig. 3 and Fig. 4 or 7 and Fig. Figure 8 shows in more detail that for each attachment point 11a, 11b, 11c, a strut 5a, 5b, 5c is provided, on each of which an elastic decoupling element 12a, 12b, 12c is attached. The decoupling elements 12a, 12b, 12c are preferably designed as cylindrical rubber plugs.

[0029] The pressure vessel 2 has - as in the Fig. 2 or the Fig. 6 is shown in more detail - for each attachment point 11a, 11b, 11c a receptacle 2a, 2b, 2c which each receives a strut 5a, 5b, 5c of the hydraulic component holder 5 provided with the elastic decoupling element 12a, 12b, 12c.

[0030] In the illustrated embodiments, the two mounting points 11a, 11b are designed as lower mounting points of the three-point bracket 11, which are spaced apart from each other, wherein the third mounting point 11c is designed as the upper mounting point of the three-point bracket 11, which is spaced apart from the two mounting points 11a, 11b in a vertical direction.

[0031] The two receptacles 2a, 2b on the pressure vessel 2 at the lower mounting points 11a, 11b are designed as pocket-like receptacles, each open on one side (in the illustrated embodiment, on the mutually facing inner sides) and on another side. In the illustrated embodiment of Fig. 1, Fig. 2, Fig. 3 to Fig. 4. The lower attachment points 11a, 11b on the top are open as a further side. In the exemplary embodiment of the Fig. 5, Fig. 6, Fig. 7 to Fig. 8 The lower mounting points 11a, 11b on an inclined front, which is inclined, for example, at 45° to the vertical, are open as a further side. The third receptacle 2c on the pressure medium reservoir 2 of the upper mounting point 11c is in both embodiments of the Fig. 1, Fig. 2, Fig. 3, Fig. 4, Fig. 5, Fig. 6, Fig. 7 to Fig. 8 is designed as a U-shaped receptacle that is open at the front. The U-shaped receptacle is, in the illustrated embodiments, the Fig. 1, Fig. 2, Fig. 3 to Fig. 4 and the Fig. 5 to 8 U-shaped and has a lower leg 2d and an upper leg 2e, between which the strut 5c of the hydraulic component holder 5 with the decoupling element 12c can be arranged.

[0032] A locking device 15 can be attached to the third receptacle 2c, by means of which the front of the U-shaped third receptacle 2c can be closed, thereby arranging the strut 5c provided with the elastic decoupling element 12c between the U-shaped receptacle 2c and the locking device 15, as shown in the Fig. 1 and the Fig. 5 is shown.

[0033] In the illustrated embodiments, the securing device 15 is designed as a retaining plate 16, which can be attached to the pressure medium reservoir 2 by means of a screw connection 17. In the illustrated embodiment, the retaining plate 16 can be attached to the receptacle 5c by means of the screw connection 17, which for this purpose is provided with a threaded bore 18 for receiving the screw connection 17. The retaining plate 16 can be inserted with its lower end into a recess 19 on the lower leg 2d of the receptacle 2c, so that after the retaining plate 16 is inserted into the recess 19 and the screw connection 17 is subsequently tightened, the strut 5c of the hydraulic component holder 5 with the decoupling element 12c is held in the receptacle 2c.

[0034] The hydraulic assembly 1, designed as a pre-assembly unit 10, is assembled at a pre-assembly workstation. In a first step, the corresponding hydraulic components 3a-3f are mounted on the hydraulic component holder 5. In a second step, the hydraulic component holder 5, equipped with the hydraulic components 3a-3f, is placed, along with the struts 5a, 5b and the decoupling elements 12a, 12b arranged thereon, into the two pocket-like receptacles 2a, 2b of the pressure medium reservoir 2. The hydraulic component holder 5 is then pivoted towards the pressure medium reservoir 2 so that the strut 5c with the decoupling element 12c arranged on it is positioned between the legs 2d, 2e of the U-shaped receptacle 2c. In a third step, the locking device 15 is mounted to fix and hold the hydraulic component holder 5, equipped with the hydraulic components 3a-3f, on the pressure medium reservoir 2.Subsequently, a hose connection 20 or pipe connection 21 of the hydraulic components 3a-3f, which are in the . Fig. 9 for the embodiment of the Fig. As shown in more detail in 5-8, it can be attached and mounted.

[0035] The one in Fig. 1 or the Fig. 5 or the Fig. The hydraulic assembly 1, shown in Figure 9 and designed as a pre-assembly unit 10, can be installed as a complete unit into the industrial truck during assembly on a main assembly line. The hydraulic component holder 5, with the hydraulic components 3a-3f arranged on it, is thus elastically attached to the pressure medium reservoir 2 before the reservoir 2 is installed in the industrial truck. Furthermore, it can be provided – as shown in the Fig.9 is shown in more detail - that the hydraulic assembly 1 designed as a pre-assembly unit 10 is already provided with the hoses 20 or pipes 21 of the hydraulic components 3a-3f before installation in the industrial truck.

[0036] The hydraulic assembly 1 according to the invention, designed as a pre-assembly unit 10, which consists of the pressure medium reservoir 2 and the hydraulic component holder 5 elastically connected to the pressure medium reservoir 2 with the hydraulic components 3a-3f attached thereto, offers a number of advantages.

[0037] With the hydraulic assembly 1 designed as a pre-assembly unit 10 according to the invention, assembly steps are shifted and relocated from the main assembly line of the industrial truck to pre-assembly workstations. Because the assembly steps for manufacturing the hydraulic assembly 1, which differ depending on the industrial truck with regard to the number and composition of the hydraulic components 3a-3f, are shifted from the main assembly line of the industrial truck to pre-assembly workstations, the same assembly and work steps are always carried out on the main assembly line for each industrial truck, despite the different hydraulic assemblies 1 for different industrial trucks. These steps are the installation and assembly of the hydraulic assembly 1, designed as a pre-assembly unit, into the respective industrial truck.For the installation and assembly of the hydraulic assembly 1, designed as a pre-assembly unit 10, into the corresponding industrial truck, it therefore makes no difference how many and which hydraulic components 3a-3f the hydraulic assembly 1 comprises, or whether it is a different pressure medium reservoir with attached hydraulic components for a different industrial truck series. This reduces the assembly time and the number of cycles on the main assembly line during the assembly of the industrial truck, which are required for the installation of the hydraulic assembly 1 and the installation of the hydraulic components 3a-3f.Furthermore, it is made possible to produce different series of industrial trucks on the same main assembly line, since with the hydraulic assemblies 1 designed as pre-assembly units 10 according to the invention, the same assembly times and number of cycles are required on the main assembly line for the installation of the respective hydraulic assembly 1 for different series of industrial trucks, so that a mixed assembly of different industrial trucks and different series of industrial trucks on one main assembly line is made possible without adverse effects on the assembly times and number of cycles.

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