Hydraulic pump configuration
A standardized hydraulic pump configuration with a disc-shaped holder and flexible tank housing simplifies motor attachment, reducing production costs and line changes, addressing the high costs of motor replacements in hydraulically actuated devices.
Patent Information
- Authority / Receiving Office
- JP · JP
- Patent Type
- Applications
- Current Assignee / Owner
- LUKAS HYDRAULIK
- Filing Date
- 2023-04-28
- Publication Date
- 2026-06-18
AI Technical Summary
The high costs and complexity of changing electric motors in hydraulically actuated handheld working or rescue devices due to the need for type changes in production lines, which are often produced in small quantities, are not adequately addressed by existing technologies.
A standardized hydraulic pump configuration using a disc-shaped holder with complementary threads for attaching electric motors, allowing easy attachment without modifying the pump or its housing, and a flexible tank housing for volume adjustment, along with a protective cage and support mechanism to minimize production line disruptions.
Enables the use of different electric motor designs with minimal impact on production costs and line changes, ensuring a simplified and cost-effective motor replacement process.
Smart Images
Figure 2026519744000001_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to a hydraulic pump configuration described in the preamble of claim 1.
Background Art
[0002] Hydraulically actuated handheld working or rescue devices include, for example, special tools that are produced in relatively small quantities, unlike battery-powered household tools. At the same time, hydraulically actuated handheld working or rescue devices often have special requirements that necessitate individually adapting the device to its specific use. Regarding the hydraulic pumps used in such devices, there is usually a common type configured specifically for that device. In contrast, electric motors are usually off-the-shelf components. However, due to the relatively small quantities, there is often a need for a type change to match the electric motor used, due to special supply situations or, in some cases, motor improvements. Therefore, the costs resulting from the necessary changes to the production line are usually disproportionately high.
[0003] European Patent No. 3434331 relates to a battery-powered handheld hydraulic pump configuration for driving a hydraulically actuated handheld working or rescue device having a hydraulic fluid loop described in the preamble of claim 1. The electric motor is here directly fastened to the end face of the hydraulic pump.
[0004] Japanese Patent Application Laid-Open No. 2004082273 discloses a hydraulic tool for removing a ceiling mounting frame, in which the motor is connected to the hydraulic pump using a gear mechanism.
[0005] German Patent No. 69221221 shows a hydraulically driven self-propelled multi-purpose tool, in which a cup-shaped housing part adjacent to the tank engages via a male thread with a complementary female thread arranged in the pump housing. In addition to forming the boundary of the tank volume, the housing part simultaneously forms a hollow space for holding the electric motor.
[0006] European Patent No. 3638378 discloses a battery-powered handheld hydraulic system for a hydraulic rescue tool, in which an electric motor having a disc-shaped rotor is directly mounted to the housing of a hydraulic tank, thereby positioning the hydraulic tank between the electric motor having the disc-shaped rotor and a hydraulic pump. [Prior art documents] [Patent Documents]
[0007] [Patent Document 1] European Patent No. 3434331 [Patent Document 2] Japanese Patent Publication No. 2004-82273 [Patent Document 3] German patent number 69221221 [Patent Document 4] European Patent No. 3638378 [Overview of the project] [Problems that the invention aims to solve]
[0008] The object of the present invention is to simplify the structure of hydraulic pump configurations belonging to the said classification. [Means for solving the problem]
[0009] The above problems are solved by the features described in claim 1. Preferred structures of the present invention are described in the dependent claims.
[0010] According to the present invention, a disc-shaped or plate-shaped holder is provided for mounting an electric motor to a hydraulic pump, and the electric motor is fastened to the hydraulic pump using male threads provided on the hydraulic pump and female threads provided on the holder that are complementary to those male threads, or using male threads provided on the holder and female threads provided on the hydraulic pump that are complementary to those male threads. Thus, the holder can be attached to the housing of the hydraulic pump using female or male threads. In this way, a standardized hydraulic pump / holder configuration can be manufactured using simple molded parts. This allows electric motors of different designs to be attached to the hydraulic pump without making any changes to the hydraulic pump or its housing. As a result, the impact on the production line is minimal, and therefore the cost required when replacing the motor can be kept relatively low.
[0011] The length of the retaining portion relative to the longitudinal range of the drive shaft is smaller than its diameter.
[0012] According to one structure of the present invention, in a radial view, the holder may protrude beyond the housing of the hydraulic pump adjacent to the holder in the assembled state. This provides the advantage that a mounting mechanism can be positioned on this protruding portion of the holder.
[0013] According to one structure of the present invention, a protective cage surrounding or covering an electric motor may be attached to the end face of the holder opposite to the hydraulic pump. Advantageously, thus, the mounting mechanism, for example, the mounting of the protective cage using a first tightening screw, may be implemented in a portion of the holder that protrudes beyond the adjacent housing of the hydraulic pump, preferably from the side assigned to the hydraulic pump. Advantageously, the protective cage may be a molded plastic part.
[0014] According to one structure of the present invention, the holding part and the electric motor may be screwed to each other.
[0015] For this purpose, the first tightening screw may engage with the stator of the electric motor from the end face of the holder facing the hydraulic pump. In this way, the electric motor can be easily pre-assembled on the holder, forming a common, manageable group of components.
[0016] According to one structure of the present invention, the driven shaft of the electric motor may pass through the holding portion and enter the housing of the hydraulic pump. In this way, the hydraulic pump side end of the driven shaft may be directly connected to the drive device of the pump piston, for example, the oscillating plate.
[0017] According to one structure of the present invention, the hydraulic tank may have a flexible tank housing (for example, made of rubber), and the leveling function is determined by the flexibility of the flexible tank housing. In this way, the hydraulic tank ensures a dual function, namely, on the one hand, the storage of a sufficient amount of hydraulic fluid, and on the other hand, a leveling function for leveling volume changes within the hydraulic fluid loop.
[0018] Preferably, the hydraulic tank or its flexible tank housing may be joined to the hydraulic pump housing using adhesive beads. This eliminates the need for additional mounting elements and allows for a particularly space-saving configuration.
[0019] According to one structure of the present invention, the adhesive beads may partially extend between the end face of the hydraulic pump housing facing the electric motor and the holder. This allows the flexible tank housing to be easily removed from the mold during the manufacturing process.
[0020] According to one structure of the present invention, the housing of the hydraulic pump may have an end-face housing projection. Advantageously, a sealing means (e.g., a so-called shaft seal) for sealing the hydraulic pump and the driven shaft of the electric motor from each other may be housed within the end-face housing projection.
[0021] According to one structure of the present invention, at least one, particularly a bridge-shaped support device, may be provided on the housing and / or the holder, so that when mechanical force generated by a working process acts on the housing of the working device or the rescue device, the housing of the working device or the rescue device is supported by the holder. In this way, it is avoided that the housing is supported on the stator of the electric motor, thereby enabling a higher degree of freedom in the selection or change of the electric motor to be used.
[0022] The present invention also relates to a working device or a rescue device according to the preamble of claim 13, provided with the hydraulic pump configuration according to claims 1 to 12.
Brief Description of the Drawings
[0023] [Figure 1] FIG. 1 shows, in a longitudinal sectional view, an example of a working device or a rescue device having a hydraulic pump configuration according to an example of the present invention. [Figure 2] FIG. 2 shows, in an enlarged longitudinal sectional view, the region of the hydraulic pump configuration from FIG. 1. [Figure 3] FIG. 3 shows the hydraulic tank and the housing of the hydraulic pump in separate perspective views. [Figure 4] FIG. 4 shows, in a perspective view, the housing of the hydraulic pump described in FIG. 3 and the hydraulic tank fastened to the housing. [Figure 5] FIG. 5 shows, in an exploded view, the components of the hydraulic pump configuration having the structure described in FIG. 1. [Figure 6] FIG. 6 shows a cross-sectional perspective view of the hydraulic pump configuration according to the structure described in FIG. 1 having the above housing.
Embodiments for Carrying Out the Invention
[0024] One advantageous structure of the present invention will be described in more detail below with reference to the drawings. For the sake of clarity, technical features that are repeatedly mentioned are only labeled with reference numerals once.
[0025] Figure 1 shows a work or rescue device 100 having as part an example of the structure of a battery-powered handheld hydraulic pump configuration according to the invention. The pump configuration is housed within a housing 101 of the work or rescue device 100. The work or rescue device 100 further comprises a hydraulic ram 103, which has a piston rod 104 located within the ram and movable back and forth, and is used to drive a multi-component tool arranged in a tool head in the form of two tool halves 106 (only one of which is shown in Figure 1). In the front region of the valve block 29 is a hollow mandrel 32 for supplying hydraulic fluid to the hollow space of the hydraulic ram 103. The transmission of the parallel motion of the piston rod 104 to the pivoting motion of the tool halves 106 is achieved using pivot arms 112, each of which is pivotably connected to one end of the piston rod 104 and to the two halves 106. The tool halves 106 pivot around a central bolt 105. Thus, the work equipment or rescue equipment 100 can be used for cutting and / or extension as needed. Instead of a pivotable tool half at the front end of the piston rod 104, only a single-piece tool in the form of a rigid tool header may be placed in that location. In this case, this is a so-called rescue ram.
[0026] The motion of the piston rod 104 within the hydraulic ram 103 is realized using pressurized hydraulic fluid, which resides in a hydraulic fluid loop and is pressurized by the hydraulic pump 2. In the illustrated example, the hydraulic pump 2 is an axial piston pump, driven by the driven shaft 6 of an electric motor 5. The latter is preferably a brushless DC motor. To drive the hydraulic pump 2, the driven shaft 6 is connected to the oscillating plate 22 of the hydraulic pump 2. When rotating, the oscillating plate 22 applies axial pressure to the individual pump pistons 23. Within the hydraulic pump 2 are multiple pump pistons 23 arranged along a circular range. The axial length of the electric motor 5, which extends parallel to the longitudinal axis of the drive shaft of the electric motor 5, is longer than its outer diameter.
[0027] On the first handle 102 of the housing 101 is an actuation element 111, for example in the form of a star-shaped handle, for manually operating the control valve 3. The control valve 3 is used to control the operation of the work equipment or rescue equipment 100, to retract or extend the piston rod 104 of the hydraulic ram 103, or to operate the hydraulic pump configuration 1 in idle mode. By operating the actuation element 111, the operator can select the corresponding operating state, for example, from the idle position to operate in a first direction (for example, the direction to retract the piston rod 104) or a second direction (for example, the direction to extend the piston rod 104). The control valve 3 is a so-called multi-way valve (for example, a three-way valve).
[0028] The area of the operating element 111 includes a dashboard 109 that can accommodate an on / off switch and multiple indicators (e.g., a charging status indicator, an operating status indicator, etc.). Inside the housing 101 is also a main board 107 (main circuit board) on which the control components for the electric motor 5 are located. On the main board 107, there is a battery slot 108 adjacent to it in the axial direction, into which a rechargeable battery can be inserted. For clarity, the battery is not shown in Figure 1.
[0029] The hydraulic tank 4 is positioned laterally to the hydraulic pump 2 and may have a flexible tank housing 18. Advantageously, the flexible tank housing 18 is made of rubber and can therefore equalize the variable volume that changes due to the movement of the piston rod 104 in the hydraulic ram 103 within the hydraulic fluid loop. Thus, the hydraulic tank 4 ensures not only its own function of storing hydraulic fluid but also a leveling function.
[0030] At the end face of the hydraulic pump 2 facing the electric motor 5, a plate-shaped holder 9 used to fasten the electric motor 5 is screwed to the housing 19 of the hydraulic pump 2. Thus, the hydraulic pump 2, holder 9, and electric motor 5 form a sandwich configuration. The hydraulic pump 2 is connected to a valve block 29 which includes a hydraulic line that opens into the hydraulic ram 103. In the region of the interface between the hydraulic ram 103 and the valve block 29, the hydraulic ram 103 overlaps the latter on the outside. Furthermore, a second handle 110 is located on the hydraulic ram 103, so that the operator can operate the work equipment or rescue equipment 100 with both hands using the first handle 102 and the second handle 110.
[0031] The hydraulic tank 4 is joined to the housing 19 of the hydraulic pump 2. For this purpose, as can be seen from the enlarged view in Figure 2, circumferential adhesive beads 17 are provided along the contact area between the tank and the housing 19 of the hydraulic pump 2, and in some areas, these beads also extend into the intermediate space between the housing 19 and the holder 9.
[0032] As can be seen in Figure 3, the pump housing 19 has a circumferential groove 25 that serves as a storage area for adhesive beads 17. Accordingly, the tank housing 18 has a corresponding circumferential projection 27, thereby creating a predetermined circumferential bonding shape for the adhesive beads 17. The housing 19 of the hydraulic pump 2 has a through-hole 24 to form a fluid connection between the inside of the hydraulic tank 4 and the hydraulic pump 2. The hydraulic tank 4 has a recess 30, which allows the holder 9, the electric motor 5, and the protective cage 12 surrounding the electric motor 5 to extend into the recess 30. Furthermore, the housing 19 of the hydraulic pump 2 has a mounting port 26 for fastening the hydraulic pump 2 to the valve block 29.
[0033] Figure 4 shows the housing 9 of the hydraulic pump 2 and the tank housing 18 of the hydraulic tank 4 in an integrally joined state. In this configuration, the above configuration can be installed. As is clear from Figure 4, the male thread 7 of the housing projection 10 extends beyond the boundary region of both the housing 19 of the hydraulic pump 2 and the tank housing 18 of the hydraulic tank 4 in the direction approaching the electric motor 5.
[0034] Figure 5 shows an exploded view of the components of the hydraulic pump configuration 1 according to the present invention. The plate-shaped holder 9 has a female thread 8 that corresponds to the male thread 7 of the housing 19 of the hydraulic pump 2, thereby allowing the holder 9 to be screwed to the housing 19 of the hydraulic pump 2. At the same time, the holder 9 is used to fasten the electric motor 5. For this purpose, a first tightening screw 15 is provided that is screwed into the stator 13 from the hydraulic pump side through the holder 9 and fixes the holder 9 to the stator 13 of the electric motor 5. The holder 9 is preferably a metal part, for example, an aluminum molded part.
[0035] In a radial view, as can be seen in Figure 2, the holder 9 extends beyond the housing 19 of the hydraulic pump 2 adjacent to the holder 9 when mounted. This provides the advantage that fastening means, in the form of a second tightening screw 16 used to connect the holder 9 to the protective cage 12 of the electric motor 5, can be positioned on this protrusion of the holder 9. The protective cage 12 encloses the electric motor 5 and its rotor 14 in minimal space, thereby protecting the electric motor 5 from adverse effects. The protective cage 12 is preferably a plastic molded part.
[0036] Therefore, according to the present invention, the protective cage 12 is attached to the holder 9 rather than directly to the stator 13 of the electric motor 5. For this purpose, a receiving portion 33 for the second tightening screw 16 is provided inside the protective cage 12.
[0037] Over a portion of its outer range, the holder 9 has a bridge-like support device 21, which supports the housing (not shown in Figure 5) in the event of mechanical adverse effects from the work equipment or rescue equipment 100, thereby preventing the housing 101 from pressing against the protective cage 12 or the electric motor 5. Mechanical adverse effects on the housing can occur, for example, when the torsional force transmitted to the housing increases during cutting, acting on the cutting tool half along with the increased cutting force.
[0038] Figure 6 shows how the housing 101 of the work equipment or rescue equipment 100 is supported by the bridge-shaped support device 21 of the holder 9. For this purpose, the inside of the housing 101 is provided with an inwardly projecting housing bridge-shaped support device 28, which has a curved inner surface that contacts the outer shape of the bridge-shaped support device 21 of the holder 9. [Industrial applicability]
[0039] This invention makes it possible to install electric motors of different designs with a simplified structure and reduced cost. [Explanation of Symbols]
[0040] 1. Hydraulic pump configuration 2. Hydraulic pump 3. Control valve 4. Hydraulic tank 5 Electric motor 6 Driven axis 7 Male screw 8 female threads 9 holders 10 Housing protrusion 11 Motor Housing 12 protective cages 13 status 14 rotors 15. First tightening screw 16. Second tightening screw 17 Adhesive Beads 18 Tank Housing 19. Hydraulic pump housing 20 shaft sealing rings 21 Support device on the holder 22. Oscillating plate 23 Pump Piston 24 Flow channel opening 25 Circumferential grooves for adhesive beads on the pump housing 26 mounting holes 27 Circumferential protrusions on the tank housing 28 Support device on housing 29 Valve block 30 recesses 31 Third tightening screw 32 Hollow Mandrels 33 Receiving part 100 rescue equipment 101 Housing 102 First Handle 103 Hydraulic Ram 104 Piston Rod 105 Center bolt 106 Tool half 107 Mainboard 108 battery slots 109 Dashboard 110 Second handle 111 Operating elements 112 Swivel Arm
Claims
1. A battery-powered handheld hydraulic pump configuration for driving a hydraulically operated handheld work device or rescue device having a hydraulic fluid loop, A hydraulic pump for supplying hydraulic fluid into the hydraulic fluid loop, A control valve for switching the flow direction of the hydraulic fluid in the hydraulic fluid loop, A hydraulic tank for storing the hydraulic fluid in the hydraulic fluid loop, A leveling function for leveling the volume change within the hydraulic fluid loop, The system comprises a stator, a rotor, and an electric motor having a driven shaft for driving the hydraulic pump, preferably a brushless electric motor. The electric motor is provided with a plate-shaped holder for fastening it to the hydraulic pump, The electric motor is fastened to the hydraulic pump using a male screw provided on the hydraulic pump and a female screw provided on the holder that is complementary to the male screw, or using a male screw provided on the holder and a female screw provided on the hydraulic pump that is complementary to the male screw. The hydraulic pump configuration is characterized in that the electric motor is fastened to the holder.
2. The hydraulic pump configuration according to claim 1, wherein, in a radial view, in the assembled state, the holder protrudes beyond the housing of the hydraulic pump adjacent to the holder.
3. The hydraulic pump configuration according to claim 1 or 2, wherein a protective cage surrounding the electric motor is fastened to the end face of the holder opposite to the hydraulic pump.
4. The hydraulic pump configuration according to any one of claims 1 to 3, wherein the holder portion and the electric motor are screwed to each other.
5. The hydraulic pump configuration according to claim 4, wherein the first tightening screw engages with the stator of the electric motor from the end face of the holder facing the hydraulic pump.
6. The hydraulic pump configuration according to any one of claims 1 to 6, wherein the driven shaft of the electric motor penetrates the holder portion and enters the housing of the hydraulic pump.
7. The hydraulic pump configuration according to any one of claims 1 to 6, wherein the hydraulic tank has a flexible tank housing, and the leveling function is defined by the flexibility of the flexible tank housing.
8. The hydraulic pump configuration according to any one of claims 1 to 7, wherein the hydraulic tank is joined to the housing of the hydraulic pump using adhesive beads.
9. The hydraulic pump configuration according to claim 8, wherein the adhesive beads partially extend between the end face of the housing of the hydraulic pump facing the electric motor and the holder.
10. The hydraulic pump configuration according to any one of claims 1 to 9, wherein the housing of the hydraulic pump has an end face side housing projection.
11. The hydraulic pump configuration according to claim 10, wherein a sealing material is contained in the housing projection on the end face side.
12. The hydraulic pump configuration according to any one of the prior claims 1 to 11, wherein the housing and / or the holder is provided with at least one, in particular, bridge-shaped support device, so that the housing of the work equipment or rescue equipment is supported by the holder by the action of mechanical forces on the housing of the work equipment or rescue equipment.
13. Hydraulic ram and A piston rod that can move back and forth within the hydraulic ram, Equipped with either an integrated tool or a multi-part tool, The hydraulic pump configuration is as described in any one of claims 1 to 11. Work equipment or rescue equipment.