CN113803445A

CN113803445A - Speed reducer with cooling system and fan

Info

Publication number: CN113803445A
Application number: CN202010543094.2A
Authority: CN
Inventors: 邬自力
Original assignee: Sew Industrial Gears Tianjin Co ltd
Current assignee: Sew Industrial Gears Tianjin Co ltd
Priority date: 2020-06-15
Filing date: 2020-06-15
Publication date: 2021-12-17

Abstract

The invention relates to a gear unit having a cooling system and a fan, wherein the fan is connected in a rotationally fixed manner to a first shaft of the gear unit, in particular to an input shaft of the gear unit, wherein the cooling system has a cooling unit, wherein the cooling unit has at least one cooler, wherein an air flow delivered by the fan flows through the cooler, and wherein an oil flow delivered by a pump flows through the cooler.

Description

Speed reducer with cooling system and fan

Technical Field

The invention relates to a retarder with a cooling system and a fan.

Background

It is known that coolers generate heat loss, in which frictional loss energy of bearings and teeth portions meshing with each other is transferred to lubricating oil.

Disclosure of Invention

The object of the invention is therefore to improve a retarder with a cooling system and a fan, while at the same time being able to discharge heat efficiently.

According to the invention, this object is achieved by a retarder according to the features of claim 1.

In the case of a gear unit, an important feature of the invention is that the gear unit has a cooling system and a fan, wherein the fan is connected in a rotationally fixed manner to a first shaft of the gear unit, in particular to an input shaft of the gear unit, wherein the cooling system has a cooling unit which has at least one cooler, wherein an air flow delivered by the fan flows through the cooler and an oil flow delivered by the pump flows through the cooler.

The advantage of this is that the cooling system is arranged on the retarder and can be operated passively/passively. In particular, the pump can be driven passively, i.e. by the shaft of the reduction gear, and the fan can also be driven passively, i.e. by the shaft of the reduction gear.

The cooling unit of the cooling system has a plurality of coolers and can be fixed to the reduction gear. The coolers here have the same design as one another. The coolers may thus be arranged in a regular polygonal arrangement such that the centre point or centre of gravity of the polygon is located on the axis of rotation of the fan. The coolers of the cooling units which are respectively closest to one another are connected to one another by means of corresponding deflection elements. In this way, the oil flow can be caused to flow circumferentially around the rotational axis of the fan.

For this purpose, the region of each cooler through which the oil flows opens into the deflecting element which is located closest to the respective cooler. The air flow delivered by the fan flows through the region of the respective cooler, in particular in the axial direction, i.e. parallel to the direction of the axis of rotation of the fan.

The region of the fan through which the oil flows and the region of the fan through which the air flows are connected to one another in a thermally conductive manner. Thus, heat transfer from the oil to the ambient air can be achieved via these two regions of the cooler. The oil is thus cooled and can then be conveyed again to the gear unit for lubrication and cooling.

In an advantageous embodiment, the pump is embodied as a shaft end pump. This has the advantage that the pump can be implemented passive.

In an advantageous embodiment, the pump for conveying the oil flow draws oil from the retarder sump of the retarder and conveys the oil through the cooler, in particular via a filter. This has the advantage that the oil can be cooled by means of the cooling system and thus can be lubricated and cooled.

In an advantageous embodiment, the cooler has a first region through which air flows and a second region through which oil flows. This has the advantage that heat is transferred from the oil to the cooler and from the cooler to the ambient air.

In an advantageous embodiment, the first region has a first corrugated plate and the second region has a second corrugated plate, in particular wherein the corrugation direction of the first corrugated plate is perpendicular to the corrugation direction of the second corrugated plate. This has the advantage that the oil flow and the air flow are oriented perpendicular to each other.

In an advantageous embodiment, two covers are provided in the first region, spaced apart from one another, perpendicular to the corrugation direction and perpendicular to the flow direction of the air flow flowing through the first region. This has the advantage that the manufacture can be carried out simply. Since the area through which air flows is simply defined by the first corrugated plate and the covering member.

In an advantageous embodiment, two covers are provided in the second region, spaced apart from one another, perpendicular to the corrugation direction and perpendicular to the flow direction of the oil flow flowing through the second region. This has the advantage that the manufacture can be carried out simply. Since the area through which the oil flows is simply defined by the second corrugation plate and the cover member.

In an advantageous embodiment, the region of the cooler through which the oil flows opens into the deflecting element, into which the region of the other cooler through which the oil flows also opens. The advantage is that a simple steering can be achieved.

In an advantageous embodiment, the first corrugation plate is arranged between the first cover in the region of the cooler through which the oil flows and the further cover in the further region through which the oil flows. This has the advantage that the oil channel can be manufactured simply.

In an advantageous embodiment, the cooler has a region through which air flows between the first region through which oil flows and the region through which oil flows in addition. This has the advantage that the area through which the air flows can be effectively utilized.

In an advantageous embodiment, each region of the cooler through which oil flows is flanked by regions of the cooler through which air flows. The advantage is that cooling on both sides is achieved.

In an advantageous embodiment, the coolers of the cooling unit form a polygonal arrangement, in particular a square arrangement, in particular wherein the center point and/or the center of gravity of the coolers of the cooling unit, i.e. of the polygonal arrangement formed by the coolers, is arranged on the rotational axis of the fan. The advantage of this is that the air flow delivered by the fan is distributed uniformly over the regular polygon and thus over the coolers arranged radially equidistant. The polygonal arrangement is a planar arrangement in which the normal direction of the plane containing the planar arrangement is oriented parallel to the axis of rotation of the fan.

In an advantageous embodiment, the cooling unit is fastened to a housing part of the gear unit. The advantage is that a simple manufacture is achieved.

In an advantageous embodiment, the cooling system has an overpressure valve, the oil flow delivered by the pump being guided directly into the interior of the gear unit when the overpressure valve is open. This has the advantage that the oil can be directly delivered into the interior space of the gear unit when the cooling unit is blocked.

In an advantageous embodiment, the cooling system has a flow controller, in particular for controlling the throughflow, for controlling the oil flow delivered by the pump to the cooling unit. This has the advantage that the oil flow can be controlled according to the temperature.

Further advantages result from the dependent claims. The invention is not limited to the combination of features of the claims. Other possible combinations of the features of the claims and/or of the individual claims and/or of the features of the description and/or of the drawings may be made by the person skilled in the art, especially in the light of the inventive task and/or the task set forth in comparison with the prior art.

Drawings

The invention will now be described in detail with reference to the schematic drawings in which:

fig. 1 shows a retarder according to the invention with a cooling system.

Fig. 2 shows an exploded view of a fan unit of the cooling system shown differently from fig. 1.

Figure 3 shows the cooling system itself.

Fig. 4 shows an oblique view of the cooler 21.

Fig. 5 shows a schematic configuration of a part of the cooler 21, in which the geometry differs from that of fig. 4.

The cooling circuit is shown in fig. 6.

List of reference numerals

1 pipeline

2 pump, in particular shaft end pump

3 Filter

4 cooling system

5 covering member

6 first shaft, in particular input shaft, of a reduction gear

7 flow controller, in particular throughflow control

8 second shaft, in particular output shaft, of a reduction gear

9 casing part

10 protective grid

20 fan, especially axial fan

21 cooler

22 steering element

23 cover plate

40 cover

41 air cooling element, in particular corrugated element

42 cover

43 oil cooling element, in particular a corrugated plate element

44 cover member

60 mechanism for detecting pressure and flow rate

61 overpressure valve

Detailed Description

As shown in fig. 1 to 4, the gear unit has a housing with a housing part 9. A bearing for rotatably mounting the first shaft 6, in particular the input shaft, is arranged in the housing, wherein the first toothed element is connected to the first shaft in a rotationally fixed manner.

The first toothed member meshes with the further toothed member. The second shaft of the gear unit, in particular the shaft of the output shaft, is also rotatably mounted by means of bearings received in the housing and is connected in a rotationally fixed manner to the last toothed part of the gear unit.

The fan 20, which is preferably designed as an axial fan, is connected in a rotationally fixed manner to the first, in particular input and thus rapidly rotating, shaft 6.

A cooling unit, in particular having four coolers 21, which are arranged in a square arrangement, is fastened to the housing. Between the coolers 21 in the circumferential direction, there are deflection elements 22, the oil-conducting channels of the coolers 21 which are closest to the respective deflection element 22, in particular directly adjacent thereto, opening into the interior space region of said deflection elements.

The air flow delivered by the fan 20 is drawn through the protective grille 10 and then flows, in particular at least partially, through, in particular, four coolers 21. The cover plate 23, which is arranged radially inside the coolers 21, prevents flow losses, i.e. the flow portion which does not flow through one of the coolers 21.

The cooler 21 comprises in each case a region through which air flows in the axial direction and further regions adjacent thereto, through which oil flows perpendicularly to the axial direction, in particular in the respective tangential direction.

The construction of the cooler 21 is shown in detail in fig. 5. In this case, an area through which oil can flow is arranged, for example, between two areas through which air can flow.

For this purpose, a stack is shown, which is formed in the stacking direction from the cover 40, the air cooling element 41 (which is designed in particular as a corrugated sheet element), the further cover 40, the oil cooling element 43 (which is designed in particular as a corrugated sheet element), the cover 40, the air cooling element 41 (which is designed in particular as a corrugated sheet element) and the further cover 40.

Covering members 42 are provided on the sides of the oil cooling member 43 that face each other; further covering parts 44 are provided on the sides of the air cooling element which face one another.

As shown in fig. 4, the stacking principle extends further to additional regions through which oil can flow and to regions connected thereto through which air can flow, which regions are also of corresponding design.

In particular the corrugation direction of the corrugated plates of the oil conveying zone is perpendicular to the corrugation direction of the corrugated plates of the air conveying zone.

By means of the line 1, the pump 2, in particular a shaft end pump driven by the further shaft of the gear unit, conveys oil from the oil sump of the gear unit to the filter 3, from which the oil is then conveyed to the deflection element 22, where the oil is then conveyed to the opposite deflection element 22 by passing the oil through the region in which the oil is conveyed, the further deflection element 22 in the circumferential direction with respect to the rotational direction of the fan 20, and the further deflection element 22 in the counter-circumferential direction. Where the oil 21 flows through the cooler 21 and is cooled. The oil thus cooled is fed to the interior space of the gear unit which is at least partially enclosed by the housing part 9.

If the cooler 21 is blocked or if the flow via the switch of the flow controller 7 is blocked, the pressure rises, which opens the overpressure valve 61, so that oil under overpressure is delivered to the retarder interior via a further line.

The oil circuit is further shown in fig. 6. The oil delivered by the pump 2 flows here through the filter 3, which also has a functional control, and then flows to the flow controller 7, in particular to the throughflow control, by means of the mechanism 60 for detecting pressure and flow rate. If the flow controller is open, the oil flows further via the cooler 21 into the inner space of the retarder.

However, if the flow controller 7 prevents the oil from flowing, the pressure at the outlet of the filter 3 rises to such an extent that the overpressure valve 61 opens and the oil is conducted back directly into the interior of the retarder.

The protective grid 10 is fixed to the covering 5 covering the cooling system 4.

In a further embodiment according to the invention, the stacking principle is extended for the construction of the cooler 21 to further regions through which oil can flow and to regions connected thereto through which air can flow, which regions are also of corresponding construction. Instead of a square arrangement of four coolers 21, other arrangements, in particular triangular, pentagonal or even more polygonal arrangements, can also be realized. The deflection element 22 is then formed with a correspondingly angled connecting region. The advantage of a greater number of corners is that heat is more annularly and thus more efficiently transferred to the air flow passing by.

Claims

1. A gear unit with a cooling system and a fan which is connected in a rotationally fixed manner to a first shaft of the gear unit, in particular to an input shaft of the gear unit, has a cooling unit which has at least one cooler through which an air flow delivered by the fan flows and through which an oil flow delivered by a pump flows.

2. The retarder of claim 1, wherein the pump is a shaft end pump.

3. Retarder according to one of the preceding claims, wherein the pump for conveying the oil flow draws oil from the retarder oil sump of the retarder and conveys the oil through the cooler, in particular via a filter.

4. A decelerator according to any preceding claim wherein the cooler has a first region through which air flows and a second region through which oil flows.

5. A reducer according to any preceding claim, wherein the first region has a first corrugated plate and the second region has a second corrugated plate, in particular wherein the corrugation direction of the first corrugated plate is perpendicular to the corrugation direction of the second corrugated plate.

6. A reducer according to any one of the preceding claims, in which there are two mutually spaced covers in the first region, perpendicular to the direction of the corrugations and perpendicular to the direction of flow of the flow of oil through the first region, and/or there are two mutually spaced covers in the second region, perpendicular to the direction of the corrugations and perpendicular to the direction of flow of the flow of oil through the second region.

7. A decelerator according to any preceding claim, wherein the region of the cooler through which oil flows opens into the reversing element, and the region of the other cooler through which oil flows also opens into the reversing element.

8. A reducer according to any one of the preceding claims, in which the first corrugated plate is arranged between the first cover member in the region of the cooler through which oil flows and the further cover member in the further region through which oil flows.

9. Decelerator according to one of the preceding claims, in which the cooler has a region through which air flows between the first region through which oil flows and the region through which oil otherwise flows.

10. Retarder according to one of the preceding claims, characterised in that each region of the cooler through which oil flows is flanked by regions of the cooler through which air flows.

11. Retarder according to one of the preceding claims, wherein the coolers of the cooling unit form a polygonal arrangement, in particular a square arrangement, in particular wherein the centre point and/or the centre of gravity of the fan is arranged on the rotational axis of the fan.

12. Retarder according to any of the preceding claims, wherein the cooling unit is fixed to a housing part of the retarder.

13. Retarder according to one of the preceding claims, wherein the cooling system has an overpressure valve, the oil flow delivered by the pump being led directly into the interior space of the retarder when the overpressure valve is open.

14. Retarder according to any of the preceding claims, wherein the cooling system has a flow controller, in particular for controlling the throughflow, for controlling the oil flow delivered by the pump to the cooling unit.