A lubrication breather system for a reduction gearbox

Abstract

The application belongs to the technical field of lubrication of reduction gearbox, and particularly discloses a lubrication and ventilation system for reduction gearbox, which comprises a lubrication structure and a ventilation structure. The lubrication structure comprises an oil collecting part, and an oil blocking rib is arranged above the oil collecting part. An installation groove is arranged in the shell. The oil collecting part comprises two side plates and an end plate. The two side plates are fixed on both sides in the length direction, and the width of the two side plates gradually increases. The end plate is fixed on the side with small width of the two side plates, and the side with large width is installed in the installation groove. An oil collecting groove is formed between the side plates, the end plate and the shell. The oil blocking rib is fixed in the shell and located in the inside of the oil collecting groove. The end plate is fixed with the oil blocking rib. An oil inlet channel is left between the oil collecting groove and the shell. An oil passing hole is arranged at the lowest position of the side plate. The ventilation structure is installed on the oil blocking rib. By increasing the oil collecting part, cooperating with the oil blocking rib, and adding the oil channel integrated on the shell and the gear shaft, a simple and reliable lubrication system is constructed, and the lubrication effect of the reduction gearbox on the limit slope can be obviously improved.

Description

Technical Field

[0001] This invention belongs to the field of gearbox lubrication technology, and particularly relates to a gearbox lubrication and ventilation system. Background Technology

[0002] The lubrication condition of gears and bearings in automotive gearboxes under operating conditions not only affects power transmission efficiency but also the gearbox's service life. Currently, splash lubrication remains a common choice in the commercial gearbox sector. However, for gearboxes with a large longitudinal dimension and a front-to-rear arrangement on a vehicle, ensuring good lubrication on slopes is often a design challenge and a key consideration influencing gearbox design. Therefore, finding a simple and reliable solution to ensure good lubrication on slopes is a worthwhile issue to consider. Summary of the Invention

[0003] The purpose of this invention is to provide a gearbox lubrication and ventilation system. By adding an oil collection component, supplemented by an oil baffle on the housing, and with oil passages integrated on the housing and gear shaft, a simple and reliable lubrication system is constructed, which can significantly improve the lubrication effect of the gearbox on extreme slopes.

[0004] To achieve the above objectives, the technical solution of the present invention is as follows: a gearbox lubrication and ventilation system, comprising a lubrication structure and a ventilation structure, wherein the lubrication structure includes at least one set of oil collecting components, and at least one set of oil baffles is provided above each set of oil collecting components; the gearbox housing has an internal mounting groove for installing the oil collecting components, the mounting groove being located above the gear set; the oil collecting component includes two side plates and an end plate, the two side plates are fixed on both sides along their length direction and are not on a straight line, the width of the two side plates gradually increases along their length direction; the end plate is fixed on the side with the smaller width of the two side plates, and the side with the larger width of the two side plates is installed in the mounting groove; the open ends of the two side plates are located on the side away from the gear set, and the side where the two side plates are connected is located at the lowest position, the side where the two side plates are connected is inclined and the side closer to the end plate is higher than the other side; the side plates, An oil collection groove is formed between the end plate and the housing. The oil baffle is fixed inside the gearbox housing and located inside the oil collection groove. The end plate is fixed to the oil baffle. An oil inlet channel is provided between the upper side of the oil collection groove and the housing. When the gear set rotates, the lubricating oil splashed up will enter the oil collection groove through the oil inlet channel. An oil passage hole is provided at the lowest position of the side plate. Oil passages are provided on the housing and gear shaft. The oil passages are connected to the oil passage hole and are used to transport lubricating oil to the position that needs lubrication. The oil baffle is used to block the splashed lubricating oil and guide it downward to the oil collection groove. A connecting hole is provided on the housing opposite the oil baffle. A venting structure is installed on the oil baffle through the connecting hole. A venting channel is provided on the oil baffle. The two venting ports of the venting channel are located on the upper and lower sides of the oil baffle, respectively. The venting structure is connected to the venting port located on the upper side of the oil baffle.

[0005] Furthermore, a horizontal positioning plate is fixed to the end of the side plate with the larger width, and several sets of positioning constraint ribs are provided above the bottom of the mounting groove; the area between the bottom of the mounting groove and the positioning constraint ribs is the mounting area for the positioning plate, and the positioning plate is interference-fitted with the mounting area.

[0006] Furthermore, the end plate and the oil baffle are connected by bolts.

[0007] Furthermore, the oil collecting components are provided in two sets, namely a first oil collecting component and a second oil collecting component. The first oil collecting component is located above the input shaft assembly and the intermediate shaft assembly, and the side of the first oil collecting component where the two side plates are connected to each other is located above the intermediate shaft assembly. The second oil collecting component is located between the output shaft assembly and the intermediate shaft assembly. An oil guide rib is provided on one side plate of the first oil collecting component near the input shaft assembly. Two sets of oil baffle ribs are correspondingly provided inside the first oil collecting component. One set of oil baffle ribs corresponds to the position where the two side plates of the first oil collecting component are connected to each other, and the other set of oil baffle ribs corresponds to the oil guide rib. An oil passage hole is provided on one side of the oil guide rib, and the position of the oil passage hole is higher than the oil guide rib.

[0008] Furthermore, the intermediate shaft assembly has a first oil passage within its gear shaft; the housing has three sets of second oil passages, each corresponding to one of three sets of oil passages, with the second oil passages on both sides supplying lubricating oil to the bearings of the input shaft assembly and the output shaft assembly, respectively; the middle second oil passage is connected to the first oil passage, and the end of the middle second oil passage is used to supply lubricating oil to the bearing at the end of the intermediate shaft assembly; the gear shaft has an oil outlet hole, the position of which corresponds to the position of the bearing; an oil guide pipe is connected to the oil outlet hole, and the oil guide pipe is used to supply lubricating oil to the bearing of the intermediate shaft assembly.

[0009] Furthermore, an oil seal is provided at the connection point between the first oil passage and the second oil passage.

[0010] Furthermore, the angle formed between the two side plates of the first oil collecting component is an obtuse angle.

[0011] Furthermore, the bottom of the oil-blocking rib has a sloping structure, and the side of the sloping structure closer to the end plate is higher than the other side.

[0012] Furthermore, the ventilation structure employs a vent plug.

[0013] The working principle and beneficial effects of this technical solution are as follows: Lubricating oil moves under the agitation of the gear set. Due to the action of the inner wall of the housing, a considerable portion of the lubricating oil will move along the wall to the upper part of the housing. At this point, the movement of the lubricating oil is blocked by the oil-blocking ribs at the top of the housing, and it falls into the oil collection groove under gravity. A straight section design (positioning plate) is adopted at the bottom of the oil collection groove, forming an interference fit with several sets of positioning constraint ribs on the housing. Simultaneously, under the action of interference pressure, it forms an effective sealing width with the housing to reduce lubricating oil leakage at extreme slopes. It is then combined with bolts at the top to fix the oil collection component to the housing. The two side plates of the first oil collection component adopt a large-angle pyramidal design, ensuring that even under the designed extreme slope conditions, the lubricating oil can still be collected to the corresponding oil passage. Furthermore, the coordinated arrangement of the oil-blocking ribs, side plates, and oil-guiding ribs distributes the lubricating oil to the designated location. The lubricating oil reaching the oil passage at the bottom of the oil collection groove is distributed to the corresponding required location through oil channels integrated on the housing and gear shaft. The connection between the first and second oil passages is sealed with an oil seal, preventing leakage under extreme slope conditions and ensuring lubrication. Furthermore, the oil collection groove, housing, and oil baffles work together to form a semi-enclosed cavity. This cavity is connected to the gearbox cavity without pressure difference, and the lubricating oil flow within it is relatively simple, with almost no radial outward flow, especially in the flat area below the oil baffles, where there is virtually no oil flow. Therefore, installing a vent valve here is a very suitable choice. In addition, due to the existence of such a large-volume oil collection groove, a considerable volume of lubricating oil will accumulate in the groove under high-speed conditions, reducing the amount of lubricating oil at the bottom of the gearbox. This reduces the churning resistance of the gear set, thereby improving the gearbox efficiency. By adding an oil collection component through simple assembly and fixing, supplemented by the cooperation of oil baffles and guide ribs, and with oil passages integrated into the housing and gear shafts, a comprehensive gearbox lubrication and venting system is constructed, effectively solving lubrication problems under extreme slope conditions and reducing churning losses. Attached Figure Description

[0014] Figure 1 This is the first perspective view of the gearbox;

[0015] Figure 2 This is a second perspective view of the gearbox;

[0016] Figure 3 This is a perspective view of the gearbox;

[0017] Figure 4 for Figure 1 The main view;

[0018] Figure 5 for Figure 1 Side view;

[0019] Figure 6for Figure 3 Schematic diagram of CIMC oil fittings;

[0020] Figure 7 for Figure 4 Sectional view of AA;

[0021] Figure 8 for Figure 5 Sectional view of BB;

[0022] Figure 9 for Figure 5 Sectional view of CC;

[0023] Figure 10 for Figure 7 A magnified view of a portion of the image. Detailed Implementation

[0024] The following detailed description illustrates the specific implementation method:

[0025] The reference numerals in the accompanying drawings include: housing 1, input shaft assembly 2, intermediate shaft assembly 3, output shaft assembly 4, first oil collector 5, second oil collector 6, venting structure 7, bolt 8, side plate 9, oil inlet channel 10, end plate 11, positioning plate 12, second oil passage 13, branch pipe 14, oil passage hole 15, oil baffle rib 16, oil guide rib 17, positioning constraint rib 18, oil seal 19, first oil passage 20, inclined surface structure 21, and venting channel 22.

[0026] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0027] The basic implementation examples are as follows: Figure 1-10 As shown: A gearbox lubrication and ventilation system, such as Figure 1-4 As shown, the gearbox includes a lubrication structure and a ventilation structure 7. The lubrication structure includes at least one set of oil collecting components (numbered 5 and 6 in the figure). Each set of oil collecting components has at least one set of oil baffles 16 above it. The gearbox housing 1 has an internal mounting groove for installing the oil collecting components, located above the gear set. Figure 6As shown, the oil collecting component includes two side plates 9 and one end plate 11. The two side plates 9 are fixed on both sides along their length and are not aligned, forming a certain angle between them. The width of the two side plates 9 gradually increases along their length. The end plate 11 is fixed to the side of the two side plates 9 with the smaller width, and is connected to the oil baffle rib 16 by bolts 8. The entire oil collecting component forms a triangular pyramid structure with one open side. The wider side of the two side plates 9 is installed in the mounting groove. Specifically, a horizontal positioning plate 12 is fixed to the end of the wider side of the two side plates 9, and several sets of positioning constraint ribs 18 are provided above the bottom of the mounting groove, such as... Figure 3 , 9 As shown. The area between the bottom of the mounting groove and the positioning constraint rib 18 is the mounting area for the mounting positioning plate 12, and the positioning plate 12 is interference-fitted with the mounting area. The open ends of the two side plates 9 are located on the side away from the gear set (i.e., on the upper side), and the side where the two side plates 9 are connected is located at the lowest position (i.e., on the lower side). The side where the two side plates 9 are connected is inclined, and the side closer to the end plate 11 is higher than the other side (e.g., ...). Figure 1 , 4 (As shown in Figures 7 and 8); an oil collection groove is formed between the side plate 9, the end plate 11, and the housing 1. The oil baffle 16 is fixed inside the gearbox housing 1 and located inside the oil collection groove, as shown in Figure 7. Figure 3 , 8 As shown in Figures 9 and 10, the oil baffle 16 is used to block the splashed lubricating oil and guide it downward into the oil collection tank.

[0028] like Figure 7 , 10 As shown, an oil inlet channel 10 is provided between the upper side of the oil collection tank and the housing 1. Lubricating oil splashed up when the gear set rotates will enter the oil collection tank through the oil inlet channel 10. An oil passage hole 15 is provided at the lowest position of the side plate 9 (e.g., ...). Figure 6 , 9 As shown), the housing 1 and the gear shaft are provided with oil passages (numbered 13 and 20 in the figure), which are connected to the oil passage 15. The oil passages are used to deliver lubricating oil to the positions that need lubrication. Figure 3 , 8 As shown, the housing 1 has a connection hole at the position opposite to the oil baffle 16. The ventilation structure 7 (specifically a vent plug) is installed on the oil baffle 16 through the connection hole. The oil baffle 16 has a ventilation channel 22. The two ventilation ports of the ventilation channel 22 are located on the upper and lower sides of the oil baffle 16, respectively. The ventilation structure 7 is connected to the ventilation port located on the upper side of the oil baffle 16.

[0029] like Figure 6 As shown, this embodiment includes two sets of oil collecting components, namely a first oil collecting component 5 and a second oil collecting component 6. The angle formed between the two side plates 9 of the first oil collecting component 5 is an obtuse angle, and the angles of the two side plates 9 of the second oil collecting component 6 are arranged according to the space inside the housing 1. Figure 4 As shown, the first oil collector 5 is located above the input shaft assembly 2 and the intermediate shaft assembly 3, and the side of the first oil collector 5 where the two side plates 9 are connected is located above the intermediate shaft assembly 3; the second oil collector 6 is located between the output shaft assembly 4 and the intermediate shaft assembly 3. Figure 6 , 8 As shown in Figures 9 and 1, an oil guide rib 17 is provided on one side plate 9 of the first oil collector 5 near the input shaft assembly 2; two sets of oil baffles ribs 16 are provided in the first oil collector 5, one set of oil baffles ribs 16 corresponds to the two side plates 9 of the first oil collector 5, and the other set of oil baffles ribs 16 corresponds to the oil guide rib 17; an oil passage hole 15 is provided on one side of the oil guide rib 17 and the position of the oil passage hole 15 is higher than that of the oil guide rib 17.

[0030] like Figure 3 , 6 As shown in Figures 7 and 9, the gear shaft of the intermediate shaft assembly 3 is provided with a first oil passage 20; the housing 1 is provided with three sets of second oil passages 13, which correspond to three sets of oil passage holes 15 respectively. The second oil passages 13 on both sides supply lubricating oil to the bearings of the input shaft assembly 2 and the output shaft assembly 4 respectively; the middle second oil passage 13 is connected to the first oil passage 20 through a branch pipe 14, and an oil seal 19 is provided at the connection position between the first oil passage 20 and the branch pipe 14. The end of the middle second oil passage 13 is used to supply lubricating oil to the bearing at the end of the intermediate shaft assembly 3; the gear shaft is provided with an oil outlet hole, the position of which corresponds to the position of the bearing; an oil guide pipe is connected to the oil outlet hole, and the oil guide pipe is used to supply lubricating oil to the bearing of the intermediate shaft assembly 3.

[0031] like Figure 8 As shown, the bottom of the oil baffle 16 is a sloping structure 21, and the side of the sloping structure 21 closest to the end plate 11 is higher than the other side.

[0032] The specific implementation process is as follows:

[0033] The lubricating oil moves under the agitation of the gear set. A significant portion of the lubricating oil moves along the inner wall of the housing 1 to the upper part of the housing 1. At this point, the movement of the lubricating oil is blocked by the oil-blocking rib 16 at the top of the housing 1, and it falls into the oil collection trough under gravity. The bottom of the oil collection trough adopts a straight section design (positioning plate 12), forming an interference fit with several sets of positioning constraint ribs 18 on the housing 1. Simultaneously, under the interference pressure, it forms an effective sealing width with the housing 1 to reduce lubricating oil leakage at extreme slopes. It is then combined with the bolts 8 at the top to fix the oil collection component to the housing 1. The two side plates 9 of the first oil collection component 5 adopt a large-angle pyramidal design, ensuring that even under the designed extreme slope conditions, the lubricating oil can still be collected to the corresponding oil passage 15. Furthermore, the coordinated arrangement of the oil-blocking rib 16, side plates 9, and oil-guiding ribs 17 distributes the lubricating oil to the designated location. The lubricating oil reaching the oil passage 15 at the bottom of the oil collection trough is distributed to the corresponding required location through oil channels integrated into the housing 1 and the gear shaft. The connection between the first oil passage 20 and the second oil passage 13 is sealed by an oil seal 19, preventing leakage under extreme slope conditions and ensuring lubrication. Furthermore, the oil collection groove, housing 1, and oil baffle 16 work together to form a semi-closed cavity. This cavity is connected to the gearbox cavity without pressure difference, and the flow of lubricating oil within it is relatively simple, with almost no radial outward flow, especially in the flat area below the oil baffle 16, where there is virtually no oil flow. Therefore, installing a vent valve here is a very suitable choice. In addition, due to the existence of such a large-volume oil collection groove, a considerable volume of lubricating oil will accumulate in the groove under high-speed conditions, reducing the amount of lubricating oil at the bottom of the gearbox. This reduces the churning resistance of the gear set, thereby improving the efficiency of the gearbox. By adding an oil collection component through a simple assembly and fixing method, and with the cooperation of oil baffle rib 16 and oil guide rib 17, plus the oil passages integrated on the housing 1 and the gear shaft, a reducer lubrication and ventilation composite system is constructed, which can solve the problem of extreme slope lubrication and reduce oil churning loss.

[0034] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0035] The above descriptions are merely embodiments of the present invention. Commonly known structures and characteristics are not described in detail here. Those skilled in the art are aware of all common technical knowledge in the field prior to the application date or priority date, are aware of all existing technologies in that field, and have the ability to apply conventional experimental methods prior to that date. Those skilled in the art can, under the guidance of this application, improve and implement this solution in combination with their own capabilities. Some typical known structures or methods should not be obstacles for those skilled in the art to implement this application. It should be noted that those skilled in the art can make several modifications and improvements without departing from the structure of the present invention. These should also be considered within the scope of protection of the present invention, and will not affect the effectiveness of the implementation of the present invention or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A gearbox lubrication and ventilation system, characterized in that: The gearbox housing (1) includes a lubrication structure and a ventilation structure (7). The lubrication structure includes at least one set of oil collecting components, and each set of oil collecting components has at least one set of oil baffles (16) above it. The gearbox housing (1) has an internal mounting groove for mounting the oil collecting components, and the mounting groove is located above the gear set. The oil collecting components include two side plates (9) and one end plate (11). The two side plates (9) are fixed on both sides along their length and are not on the same straight line. The width of the two side plates (9) gradually increases along their length. The end plate (11) is fixed to the side with the smaller width of the two side plates (9), and the side with the larger width of the two side plates (9) is installed in the mounting groove; the open ends of the two side plates (9) are located on the side away from the gear set, and the side where the two side plates (9) are connected to each other is located at the lowest position, and the side where the two side plates (9) are connected to each other is inclined and the side closer to the end plate (11) is higher than the other side; an oil collection groove is formed between the side plates (9), the end plate (11) and the housing (1), and the oil baffle (16) is fixed to the... The gearbox housing (1) is located inside the oil collection tank; the end plate (11) is fixed to the oil baffle (16); an oil inlet channel (10) is provided between the upper side of the oil collection tank and the housing (1), and the lubricating oil splashed up when the gear set rotates will enter the oil collection tank through the oil inlet channel (10); an oil passage hole (15) is provided at the lowest position of the side plate (9), and oil passages are provided on the housing (1) and the gear shaft, the oil passages are connected to the oil passage hole (15), and the oil passages are used to transport the lubricating oil to the position that needs lubrication. The oil baffle (16) is used to block the splashed lubricating oil and guide it downward into the oil collection groove; the housing (1) is provided with a connection hole in front of the oil baffle (16), and the ventilation structure (7) is installed on the oil baffle (16) through the connection hole. The oil baffle (16) is provided with a ventilation channel (22), and the two ventilation ports of the ventilation channel (22) are located on the upper and lower sides of the oil baffle (16) respectively. The ventilation structure (7) is connected to the ventilation port located on the upper side of the oil baffle (16). The oil collecting components are provided in two sets, namely a first oil collecting component (5) and a second oil collecting component (6). The first oil collecting component (5) is located above the input shaft assembly (2) and the intermediate shaft assembly (3), and the side of the two side plates (9) of the first oil collecting component (5) connected to each other is located above the intermediate shaft assembly (3). The second oil collecting component (6) is located between the output shaft assembly (4) and the intermediate shaft assembly (3). The first oil collecting component (5) has an oil guide rib (17) on one side plate (9) near the input shaft assembly (2). The first oil collecting component (5) is provided with two sets of oil baffle ribs (16). One set of oil baffle ribs (16) corresponds to the position of the two side plates (9) of the first oil collecting component (5) connected to each other, and the other set of oil baffle ribs (16) corresponds to the oil guide ribs (17). The oil guide ribs (17) have an oil passage hole (15) on one side, and the position of the oil passage hole (15) is higher than the oil guide ribs (17).

2. The gearbox lubrication and ventilation system according to claim 1, characterized in that: A horizontal positioning plate (12) is fixed to the end of the side plate (9) with the larger width. Several sets of positioning constraint ribs (18) are provided above the bottom of the mounting groove. The mounting area of ​​the positioning plate (12) is between the bottom of the mounting groove and the positioning constraint ribs (18). The positioning plate (12) is interference-fitted with the mounting area.

3. The gearbox lubrication and ventilation system according to claim 1, characterized in that: The end plate (11) and the oil baffle (16) are connected by bolts (8).

4. The gearbox lubrication and ventilation system according to claim 1, characterized in that: The intermediate shaft assembly (3) has a first oil passage (20) inside the gear shaft; the housing (1) has three sets of second oil passages (13), which correspond to three sets of oil passages (15) respectively. The second oil passages (13) on both sides respectively supply lubricating oil to the bearings of the input shaft assembly (2) and the output shaft assembly (4); the middle second oil passage (13) is connected to the first oil passage (20), and the end of the middle second oil passage (13) is used to supply lubricating oil to the bearing at the end of the intermediate shaft assembly (3); the gear shaft has an oil outlet hole, the position of which corresponds to the position of the bearing; an oil guide pipe is connected to the oil outlet hole, and the oil guide pipe is used to supply lubricating oil to the bearing of the intermediate shaft assembly (3).

5. A gearbox lubrication and ventilation system according to claim 4, characterized in that: An oil seal (19) is provided at the connection position of the first oil passage (20) and the second oil passage (13).

6. A gearbox lubrication and ventilation system according to claim 1, characterized in that: The angle formed between the two side plates (9) of the first oil collecting component (5) is an obtuse angle.

7. A gearbox lubrication and ventilation system according to claim 1, characterized in that: The bottom of the oil baffle (16) is a sloping structure (21), and the side of the sloping structure (21) closer to the end plate (11) is higher than the other side.

8. A gearbox lubrication and ventilation system according to claim 1, characterized in that: The ventilation structure (7) uses a vent plug.

Images