WO2021244917A1 - Gear pump for metered delivery of color coatings - Google Patents

Abstract

The invention relates to a gear pump for the metered delivery of color coatings, in particular for use on a painting robot, the gear pump comprising two meshing gears which are mounted rotatably inside a pump housing by a driven drive shaft and a fixed bearing shaft, and the pump housing having a first housing panel and a second housing panel. For weight reduction, components of the gear pump are provided with cut-outs, and the drive shaft is mounted in a statically determined manner in its axial and radial direction in the first housing panel and in the second housing panel without intermediate bearing.

Description

Gear pump for the metered delivery of colored lacquers

The invention relates to a gear pump for the metered delivery of paints according to the preamble of claim 1.

A generic gear pump is known from EP 1653083 A1. The known gear pump has two intermeshing gears which are mounted within a pump housing. One of the gears is held on the circumference of a drive shaft, which is stored in multiple undefined position stanchions within the pump housing.

The disadvantage of this multiple indeterminate storage is that the drive shaft is exposed to unnecessary stresses, which can lead to higher bearing forces and the drive shaft is worn out more quickly.

In addition, higher driving forces are required, which in turn requires a higher current requirement.

In addition, the multiple indeterminate bearings require larger component dimensions. The additional components of the known gear pump lead to a higher weight of the same.

The known gear pump is used in paint atomization devices for painting components, for example vehicle parts. In order to treat complex components within a painting device, it is known to use painting robots that have a painting nozzle device on a pivot arm provided for this purpose, which is supplied with the paint to be conveyed via the gear pump. A painting robot suitable for this is known, for example, from EP 1 447813 A1.

In order to enable a simple and better conveyance of the paint to the painting nozzle device, it is proposed that the gear pump be arranged as close as possible to the painting nozzle device.

In addition, the robot arm has to carry additional weight, as a result of which additional acceleration forces, inertia forces and braking forces act on the robot. Overall, this leads to a higher expenditure of energy and a greater load on the robot arm.

The object of the invention is therefore to provide a gear pump which can withstand acceleration forces, inertia forces and braking forces caused by the movement of the robot arm and, on the other hand, does not cause any additional unnecessary weight on the robot arm.

The object is achieved according to the invention by a gear pump having the features according to claim 1.

Advantageous developments of the invention are defined by the features and combinations of features of the subclaims.

The invention is characterized in that, due to the statically determined mounting of the drive shaft, fewer bearing points are necessary in the pump housing and the gear pump can therefore be made more compact and thus also with fewer components, so that the gear pump overall has a lower weight. In addition, additional recesses are provided in the components in the gear pump to save additional weight.

This offers the advantage that the robot arm of the painting robot has to carry less weight, as a result of which the painting device and the gear pump can be positioned more precisely and with less expenditure of energy.

According to one aspect of the invention, a gear pump for the metered delivery of paints, in particular for use on a painting robot, is provided with two intermeshing gears which are rotatably mounted within a pump housing by a driven drive shaft and a stationary bearing shaft, the pump housing having a first Has housing plate and a second housing plate, with at least the first and / or the second housing plate of the gear pump being provided with recesses to reduce weight and the drive shaft being statically determined in its axial and radial direction in the first housing plate and in the second housing plate without intermediate bearings.

To reduce weight, additional and / or other components of the gear pump can be provided with recesses that contribute to the reduction in weight. For example, the drive shaft can be formed as a hollow shaft.

According to an exemplary embodiment of the gear pump, the drive shaft has a first bearing area, a second bearing area and a sealing area which is arranged between the first and the second bearing area. The first and second bearing area are to be understood as meaning the areas of the drive shaft in which the drive shaft is radially and / or axially gela. According to one embodiment of the gear pump, the drive shaft is mounted radially with its first bearing area in one housing plate and with its second bearing area in the other housing plate in a multiaxial manner, at least axially and radially, with a center plate for receiving the meshing gears between the first and second housing plates is arranged and the drive shaft of the axial bearing of a Ge housing plate through the center plate and the other housing plate he stretches. Due to the radial storage in one housing plate and the axial and radial storage in the other housing plate, the drive shaft is stored statically and there can be fewer additional loads on the drive shaft and fewer components are required, which leads to an additional weight reduction. In addition, the drive shaft can be made of a lighter and less rigid material.

According to one embodiment of the gear pump, a shaft seal is arranged in the other hous ing plate adjacent to the multi-axis bearing, which is arranged between the drive shaft and the other housing plate and has a locking template. The seal prevents the fluid to be pumped from leaking from the drive shaft and the barrier template prevents ambient air from being sucked in.

According to one embodiment of the gear pump, the first and / or the second housing plate has a flange section, the flange section extending from and away from the housing plate and defining a cylindri's receiving space in which the sealing area and one of the bearing areas of the drive shaft together with the associated bearing and shaft seal are at least partially arranged and / or the drive shaft extends out of the flange section, so that the drive shaft can be connected to a drive source by means of a drive coupling area. According to one embodiment of the gear pump, the diameter of the drive shaft on the second bearing area is different from the diameter of the drive shaft on the first bearing area and sealing area, so that a stepped section is formed between the respective areas. Axial mounting of the drive shaft is possible by means of the step section.

According to one embodiment of the gear pump, the axial and radial bearing in the flange section engages the stepped section of the drive shaft and is adjacent to a support plate which fixes the axial and radial bearing in the flange section.

According to one embodiment of the gear pump, the sealing area of the drive shaft has a first and a second sealing section, each of which is arranged in the second housing plate and in the flange section, and a locking template is formed between the first sealing section and the second sealing section.

According to one embodiment of the gear pump both the receptacles for the shaft seal, the locking template and the multi-axis bearing of the drive shaft are formed in the second housing plate. This allows a more compact and thus lighter design of the gear pump.

According to one embodiment of the gear pump, a flushing and / or supply channel for flushing and / or supply with larger internal dimensions and / or a recess for Weight reduction trained. In the gear pump, all required supply channels are provided with larger dimensions to reduce weight. In addition, additional recesses and dead spaces are advantageously provided in order to save weight. The gear pump according to the invention is explained in more detail below on the basis of some exemplary embodiments with reference to the accompanying figures.

They represent:

1 schematically shows a front view according to view A-A from FIG. 2 of a first exemplary embodiment of the gear pump according to the invention, and

Fig. 2 schematically shows a sectional view according to section line B-B of the Ausfüh approximately example of the gear pump of FIG.

1 shows a first exemplary embodiment of the gear pump 1 according to the invention, which is explained below with reference to FIG.

1 shows a front view of the gear pump 1 according to the invention on the support plate 14, with a drive coupling area 5.4 of a drive shaft 5 for coupling to a drive unit, such as an electric motor, being Darge.

Furthermore, recesses for a screw connection 202 and centering bolts 201 are formed in the second housing plate 10.2.

As shown in the sectional view of FIG. 2, the gear pump 1 has a pump housing 10. The pump housing 10 has a first housing plate 10.1, a second housing plate 10.2, a center plate 2 arranged between the first and two housing plates 10.1 and 10.2 for receiving a driven gear 3 and a driven gear 4 and a support plate 14 mounted on the second housing plate 10.2.

The middle plate 2 has first and second recesses 30, 31 for the two meshing gears 3 and 4.

The gear 3 is rotatably mounted on a first bearing shaft 6. The La gerwelle 6 is for this purpose in a receiving bore 7 rotatably and fixedly connected to the housing plate 10.1.

Between the bearing shaft 6 and the housing plate 10.1 one in the receiving bore 7 introduced sealing ring 8 is arranged.

The second gear 4 is fixed to the drive shaft 5 by means of a fixing pawl 50 in such a way that the second gear 4 can be rotated by means of the drive shaft 5.

The drive shaft 5 can be divided into a first bearing area 5.1, a sealing area 5.2, a second bearing area 5.3 and the drive coupling area 5.4, each area relating to different sections of the drive shaft.

The drive shaft 5 has two bearing areas 5.1 and 5.3, which are each defined by the first and the second housing plate 10.1, 10.2. Since the drive shaft 5 is stored statically determined. This offers several advantages: The drive shaft is not stored statically indefinitely multiple times and components for mounting the drive shaft 5 can be saved.

The drive shaft 5 is rotatably mounted in the first bearing area 5.3 with one free end in a bearing pocket bore 9 of the first housing plate 10.1 and with a bearing gap 90 between the housing plate 10.1 and 10.1 the free end of the drive shaft 5 mounted. The drive shaft 5 is radially, that is, uniaxially mounted in the La gersack bore 9 of the housing plate 10.1.

The drive shaft 5 has in the second bearing area 5.3 on the opposite side of the gear 4 each different inner diameter and is rotatably mounted in the housing plate 10.2 in bearing bores 111, 112 and 113 and there is radially R and axially Ax.

The other end of the drive shaft 5 opposite the free end is seated and mounted in the bearing bores 111, 112, 113 both in a sealing manner and axially Ax and radially R, that is to say multi-axially mounted.

Multi-axis storage is understood to mean both axial Ax and radial R location tion of the drive shaft 5 in the associated bearing bores 111, 112, 113 of the housing plate 10.2. The first bearing bore 112 receives a first shaft seal 51, the second bearing bore 111 receives a second shaft seal 52 and the third bearing bore 113 receives a multi-axis bearing 200.

As can be seen from the cross-sectional view in Fig. 2 according to section line B-B from Fig. 1, 9 additional recesses are formed in the first housing plate 10.1 next to the Lagersackboh tion, which ben several functions.

For example, flushing channels 110 are provided in the housing plate 10.1, which are designed to be enlarged in their diameter for better weight reduction. Furthermore, the receiving bore 7 is designed as a fitting bore in the housing plate 10.1, so that the bearing shaft 6 is received therein in a stationary and non-rotatable manner. In addition, in a side section of the housing plate 10.1, which is opposite to the drive coupling area 5.4 of the drive shaft 5, a groove for receiving a sealing ring 8 is formed in the receiving bore 7 of the bearing shaft 6 at the end.

The fixed bearing shaft 6 is also provided with additional flushing channels 116, which are also designed for flushing the space between the gears 4 and 3, for example to remove paint residues so that other colors are not contaminated with the previous paint.

In an embodiment of the gear pump 1, not shown, additional weight-reducing bores are provided on the second housing plate 10.2, which are not in connection with the flushing channels. To reduce weight Ge, the flushing channels 116 of the bearing shaft 6 can also be enlarged ver. In addition, the housing plate 10.2 has an enlarged supply channel bore 11 of a locking template 114, which ensures additional weight reduction. Optionally, the drive shaft 5 can be designed as a flea shaft.

To accommodate the first gear 3 and the second gear 4, corresponding gear bearing recesses 31, 32 are provided in the center plate 2, which at least partially surround the respective first gear 3 and second gear 4 for conveying a liquid, in particular a paint, in a correspondingly precisely fitting manner.

The first housing plate 10.1 is connected to the second housing plate 10.2 in a fluid-tight manner via the center plate 2.

The first housing plate 10.1 and the second housing plate 10.2 adjoin the center plate 2 in a fluid-tight manner. The first housing plate 10.1, the middle plate 2 and the second housing plate 10.2 are connected to one another in a fluid-tight manner by means of sealing rings 80 at joints, so that the fluid to be conveyed, such as, for example, a colored lacquer, cannot penetrate to the outside.

The second housing plate 10.2 also has several recesses for different functions, the recess each being optimized and dimensioned in such a way that an additional weight reduction is also achieved in the housing plate 10.2.

In the housing plate 10.2, bearing bores 112, 113 are formed for a first sealing section 5.21 and a second sealing section 5.22 of the drive shaft 5 and for a locking template 114, which form the sealing area 5.2. The first sealing section 5.21 and the second sealing section 5.22 each have the first shaft seal 51 and the second shaft seal 52, respectively.

The sealing area 5.2 has the blocking template 114, which is formed between the first sealing section 5.21 and the second sealing section 5.22.

In the first sealing section 5.21 and the second sealing section 5.22, the shaft seals 51, 52 are provided, and between them the blocking template 14, which seals the drive shaft 5 in a fluid-tight manner, so that no conveying medium and no air can be sucked in via the gear pump.

The barrier template 114 can preferably be closed with a liquid in order to prevent ambient air from being sucked in. The liquid from the blocking position 114 can be supplied via the supply channel bore 11. The supply channel bore 11 is provided in the second housing plate 10. 2 and has a connecting channel 117 to the locking template 114. The locking template 114 is formed circumferentially around the drive shaft 5. On the opposite At the end of the supply channel bore 11 away from the connection channel and towards the outside of the housing plate, the supply channel bore 11 is provided with a thread so that the supply channel bore 11 can be closed with a screw cap (not shown).

The supply channel bore 11 is designed with an enlarged diameter, so that the housing plate 10.2 has a lower weight. The enlarged diameter of the supply channel bore 11 can be enlarged in the range from 10 to 200% and even larger, as far as the component thickness of the second housing plate permits.

The housing plate 10.2 also has a flange section 40 which protrudes in one piece from the housing plate 10.2.

The second sealing section 5.22 and the second bearing area 5.3 of the drive shaft 5 with a multi-axis bearing 200 for multi-axis bearing of the drive shaft 5 are accommodated in the flange section 40. The multi-axis bearing 200 can be, for example, a ball bearing, a roller bearing with an associated cage.

In the assembled state, the ball and roller bearings function as radial R bearings and the associated cage as axial fixation of the drive shaft 5, a step section 53 of the drive shaft 5 cooperating with a section of the second housing plate 0.2.

For the axial bearing of the drive shaft 5 in the second housing plate 10.2, the drive shaft 5 can be provided with a stepped section 53 which defines the beginning of the second bearing area 5.3 of the drive shaft 5 for the multi-axis bearing 200. The step section 53 can be a recess, projection and / or shoulder on the drive shaft 5. The drive shaft 5 2, in the exemplary embodiment shown, has different diameters for the radial R and axial Ax bearings in the second housing plate 10.2, so that a corresponding recess, projection and / or shoulder is formed.

In an embodiment of the pump housing (not shown), the drive shaft 5 has a constant diameter from the first bearing area 5.1 to the second bearing area 5.3 and beyond. In this exemplary embodiment, the axial bearing 200 on the drive shaft 5 can be achieved by means of Fi xierringe, which engage in grooves in the drive shaft 5 and in the housingseplatte 10.2.

The bearing 200 is held in position by the support plate 14, which is detachably mounted in the flange section 40 by means of a screw connection 41.

The second housing plate 10.2 of the gear pump 1 according to the invention has several functions:

First, the second housing plate 10.2 is designed to form a sealing area 5.2, in which receiving bores 11, 117, 111 are designed for an annular blocking template 114.

Secondly, the multi-axis mounting of the drive shaft 5 in the axial Ax and radial R directions is formed in the second housing plate 10.2 with the flange section 40.

Thirdly, the flange section 40 of the second housing plate 10.2 is designed for fastening the support plate 14.

Claims

Patent claims: 1. Gear pump (1) for the metered delivery of colored lacquers, in particular for use on a painting robot, with two intermeshing gears (3, 4) which are driven by a driven drive shaft (5) and a fixed bearing shaft (6) within a pump housing ( 10) are rotatably mounted, the pump housing having a first housing plate (10.1) and a second housing plate (10.2), characterized in that at least the first and / or the second housing plate of the gear pump are provided with recesses and the drive shaft to reduce weight is stored statically determined in the axial (A) and radial (R) direction in the first housing plate and in the second housing plate without intermediate bearings. 2. Gear pump according to claim 1, characterized in that the drive shaft (5) has a first bearing area (5.1), a second bearing area (5.3) and a sealing area (5.2) which is arranged between the first and the second bearing area 3. Gear pump according to one of the preceding claims, characterized in that the drive shaft (5) is mounted radially with its first bearing area (5.1) in one housing plate (10.1) and with its second bearing area (5.3) in the other housing plate (10.2 ) is multi-axially at least axially and radially (53, 200), a center plate (2) for receiving the meshing gears (3, 4) is arranged between the first and the second housing plate and the drive shaft extends from the axial bearing of the a housing plate extends through the middle plate (2) and the other housing plate. 4. Gear pump according to claim 3, characterized in that in the housing plate (10.2) adjoining the multi-axis bearing (200) a shaft seal (51, 52) is arranged, which is between the drive shaft (5) and the other housing plate ( 10, 2) is arranged and has a blocking template (114). 5. Gear pump according to one of the preceding claims, characterized in that the first and / or the second housing plate has a flange portion (40), wherein the flange portion extends from and away from the housing plate and defines a cylindrical receiving space in which the Sealing area (5.2) and one of the bearing areas (5.3) of the drive shaft together with the associated bearing (200) and shaft seal (5.21, 5.22) are at least partially arranged and / or the drive shaft (5) extends out of the flange section so that the drive shaft (5) can be connected to a drive source by means of a drive coupling area (5.4). 6. Gear pump according to one of the preceding claims, characterized in that the diameter of the drive shaft (5) on the second bearing area (5.3) is different than the diameter of the drive shaft on the first bearing area (5.1) and sealing area (5.2), so that a step portion (53) is formed between the respective areas. 7. Gear pump according to claim 6, characterized in that the axial and radial bearing (200) in the flange portion (40) in engagement with the Step section (53) of the drive shaft (5) is and is adjacent to a support plate (14) which fixes the axial and radial bearing (200) in the flange section (40). 8. Gear pump according to one of the preceding claims, characterized in that the sealing area (5.2) of the drive shaft has a first and a second sealing section (5.21, 5.22), each in the second housing plate (10.2) and in the flange section ( 40) are arranged, and that a blocking template (114) is formed between the first sealing section (5.1) and the second sealing section (5.2). 9. Gear pump according to one of the preceding claims, characterized in that both the receptacles for the shaft seal (51, 52), the locking template (114) and the multi-axis bearing (53; 200) of the drive shaft (5) are formed in the second housing plate are. 10. Gear pump according to one of the preceding claims, characterized in that in the first and / or second housing plate, in the middle plate, in the bearing shaft and / or in the drive shaft, a flushing and / or supply channel for flushing and / or Provide with larger interior dimensions and / or a recess for weight reduction are formed.