Drive system for a forklift truck

Abstract

The invention relates to a drive arrangement for a forklift truck with a drive motor 1 arranged on a metallic frame plate 4, with one or more flat flange surfaces 15 of the frame plate 4, which are supported on one or more likewise flat mounting surfaces of a vehicle frame and can be connected to a vehicle frame by means of a screw connection. A vertical drive shaft rotatably driven by the drive motor 1, from which a wheel can be rotatably driven via a gear unit, is also included. The frame plate 4, designed as a cast component, has recesses for the screw connection at its opposing edge regions 7 extending in the longitudinal direction 6 of the vehicle, and has a greater wall thickness in its regions 9 extending wholly or partially transversely to the longitudinal direction 6 of the vehicle than in the opposing edge regions 7 extending in the longitudinal direction 6 of the vehicle.

Description

[0001] The invention relates to a drive arrangement for a forklift truck with a drive motor arranged on a metallic frame plate, with one or more flat flange surfaces of the frame plate which are supported on one or more likewise flat mounting surfaces of a vehicle frame and can be connected to a vehicle frame by means of a screw connection, with a vertical drive shaft rotatably driven by the drive motor, from which a wheel can be rotatably driven via a gear unit.

[0002] In a known drive arrangement for a forklift truck, the frame plate consists of a steel plate of uniform thickness across its entire surface, resulting in a high weight for the frame plate. This leads to a high unsprung mass of the drive arrangement and thus to increased wear and tear on the forklift truck's components.

[0003] A steel plate of the same thickness requires a lot of material because it has a uniform thickness across its entire surface. Furthermore, a through-hole in the center of the frame plate results in a significant amount of offcuts, making the frame plate expensive.

[0004] The object of the invention is therefore to create a drive arrangement for a forklift truck of the type mentioned above that avoids these disadvantages, has a simple, lighter and cost-effective design and leads to a reduction in the unsprung mass of the components of the forklift truck.

[0005] This problem is solved according to the invention by the fact that the frame plate, which is designed as a cast component, has recesses for the screw connection in its opposite edge regions extending in the longitudinal direction of the vehicle, and has a greater wall thickness in its regions extending wholly or partially transversely to the longitudinal direction of the vehicle than in the opposite edge regions extending in the longitudinal direction of the vehicle.

[0006] This design according to the invention significantly reduces the weight of the frame plate and thus of the drive arrangement, which leads to a reduction in the unsprung mass of the components of the industrial truck and thus to an increase in their service life.

[0007] The frame plate can have a through-opening in the central area between the edge areas extending in the longitudinal direction of the vehicle, which is completely or partially enclosed by the areas of greater wall thickness.

[0008] If the drive motor is connected to the frame plate in areas of greater wall thickness, then, to reduce weight, areas of greater wall thickness in the frame plate are only present where an increased load acts upon it.

[0009] The recesses for the screw connection can consist of multiple holes arranged one behind the other in the longitudinal direction of the vehicle, spaced apart from each other, through which screws can be inserted for fastening to the vehicle frame. This arrangement of the recesses results in good absorption of the operating forces of the drive unit.

[0010] The frame plate can further have a non-continuous receiving recess into which a steering motor can be inserted, wherein preferably the receiving recess is completely or partially enclosed by a region of greater wall thickness of the frame plate and thus provides good absorption of the forces emanating from the steering motor while reducing the weight of the frame plate.

[0011] The flange surfaces of the frame plate are preferably formed along the opposing edge areas of the frame plate extending in the longitudinal direction of the vehicle.

[0012] This ensures that the flange surfaces of the frame plate are at least largely free of play and securely seated on the mounting surfaces of the vehicle frame.

[0013] The frame plate can be made of spheroidal graphite cast iron, a cost-effective material that absorbs operating forces well.

[0014] Depending on space requirements, areas of greater wall thickness can be formed on the top and / or bottom of the frame panel.

[0015] An embodiment of the invention is shown in the drawing and is described in more detail below. The drawing shows... Fig. 1 A perspective view of a drive arrangement for a forklift truck Fig. 2 an enlarged perspective top view of a frame plate of the drive arrangement according to Fig. 1 Fig. 3 an enlarged perspective bottom view of the frame plate after Fig. 1 Fig. 4 an enlarged perspective side view of the frame plate according to Fig. 1 Fig. 5 an enlarged perspective bottom view of a second embodiment of a frame plate.

[0016] The in Fig. The drive arrangement shown in Figure 1 for a forklift truck has a drive motor 1 which has a vertical drive shaft (not shown).

[0017] A drive wheel (not shown) can be rotatably driven about a horizontal drive wheel axis 3 from the drive shaft via a gear unit arranged in a gear housing 2.

[0018] The drive motor 1 can be attached to a frame plate 4 using screws (not shown).

[0019] The frame plate 4 is designed as a cast component made of spheroidal graphite cast iron and has a through opening 5 in its central area.

[0020] On their edge areas 7, which extend in the longitudinal direction 6 of the vehicle and are opposite each other and are of lesser thickness, there is a series of several holes 8 arranged one behind the other at a distance from each other, through which screws can be passed for screwing to a vehicle frame (not shown).

[0021] In its areas 9 extending transversely to the longitudinal direction 6 of the vehicle, i.e. towards the front 10 and the rear 11 of the vehicle, the frame plate 4 has a greater wall thickness than in the opposing edge areas 7 extending in the longitudinal direction 6 of the vehicle, i.e. towards the right side 12 and left side 13 of the vehicle. Fig. 1. The areas 9 even extend radially around the passage opening 5.

[0022] The areas 9 of greater thickness towards the front 10 of the vehicle and towards the rear 11 enclose the passage opening 5.

[0023] As in Fig. As can be seen in Figure 3, the underside of the frame plate 4 has flange surfaces 15 which extend in the opposite edge areas of the frame plate 4 in the longitudinal direction 6 of the vehicle and with which the frame plate rests on mounting surfaces of a vehicle frame not shown.

[0024] In its right rear area, the frame plate 4 has a receiving recess 16 into which a steering motor of the drive arrangement (not shown) can be inserted.

[0025] In order to absorb the forces acting on the frame plate 4 by the steering motor in a weight-saving manner, the receiving recess is enclosed by a further 17 area of ​​great wall thickness.

[0026] As in Fig. As shown in Figure 5, areas 9 and 17 with greater wall thickness can be formed on the top and / or bottom of the frame plate 4. Reference sign 1 drive motor 2 gearbox housings 3 wheel axle 4 frame plate 5 Through opening 6 Vehicle longitudinal direction 7 peripheral areas 8 holes 9 thick areas 10 Vehicle front 11 Vehicle rear 12 right side of vehicle 13 left side of vehicle 15 flange surfaces 16. Admission exemption 17 other areas

Claims

Drive arrangement for a forklift truck with a drive motor (1) arranged on a metallic frame plate (4), with one or more flat flange surfaces (15) of the frame plate (4) which are supported on one or more likewise flat mounting surfaces of a vehicle frame and can be connected to a vehicle frame by means of a screw connection, with a vertical drive shaft rotatably driven by the drive motor (1), from which a wheel can be rotatably driven via a gear unit, characterized in that the frame plate (4), which is designed as a cast component, has recesses for the screw connection on its opposing edge regions (7) extending in the longitudinal direction (6) of the vehicle, and has a greater wall thickness in its regions (9) extending wholly or partially transversely to the longitudinal direction (6) of the vehicle than in the regions extending in the longitudinal direction (6).opposite border areas (7). Drive arrangement according to claim 1, characterized in that the frame plate (4) has a through opening (5) in the central area between the edge areas (7) extending in the longitudinal direction (6) of the vehicle, which is completely or partially enclosed by the areas (9) of greater wall thickness. Drive arrangement according to claim 2, characterized in that the drive motor (1) is connected to the frame plate (4) in the areas (9) of greater wall thickness. Drive arrangement according to one of the preceding claims, characterized in that the recesses for the screw connection are a plurality of bores (8) formed one behind the other in the longitudinal direction of the vehicle (6) at a distance from each other, through which screws for screwing to the vehicle frame can be passed. Drive arrangement according to one of the preceding claims, characterized in that the frame plate (4) has a non-continuous receiving recess (16) into which a steering motor can be inserted. Drive arrangement according to claim 5, characterized in that the receiving recess (16) is wholly or partially enclosed by a further area (17) of greater wall thickness of the frame plate (4). Drive arrangement according to one of the preceding claims, characterized in that the flange surfaces (15) are formed along the opposite edge regions (7) of the frame plate (4) extending in the longitudinal direction (6) of the vehicle. Drive arrangement according to one of the preceding claims, characterized in that the frame plate (4) is made of spheroidal graphite cast iron. Drive arrangement according to one of the preceding claims, characterized in that the areas (9, 17) of greater wall thickness are formed on the top and / or on the bottom of the frame plate (4).

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