Loader gearbox oil retaining and ventilation structure

Abstract

The present invention discloses an oil-blocking and breathable structure for a loader gearbox: a breathable membrane assembly includes a closed cylindrical outer oil-proof membrane, an intermediate waterproof membrane, an inner oil-proof membrane and an "M"-shaped breathable membrane; a dust-proof pad includes a disc-shaped upper spacer and a closed cylindrical lower spacer ring around it, and the upper spacer is attached to the breathable membrane assembly sleeved in the dust-proof pad; one breathable net is clamped on the upper part of the inner hole of the threaded head with an inner retaining spring, and the other is locked with an oil-blocking pipe and pressed against the lower part of the inner hole of the threaded head; the oil-blocking pipe includes a hat-shaped connecting plate with an external thread on the head and a barrel-shaped round tube with a rectangular opening on the side; the lower end of the inner hole of the threaded head locks the oil-blocking pipe connecting plate, and the upper end is sleeved in the breathable membrane assembly, and the fitting surface of the upper end of the threaded head where the filter plate is placed is provided with a pentagonal breathable hole. The present invention solves the problems in the prior art of low processing and assembly efficiency, high manufacturing and maintenance costs due to many processed parts, and gearbox oil leakage caused by aging, damage, and accidental deformation of the air pipe of the external breathable joint of the filter device.

Description

Technical Field

[0001] The invention relates to the technical field of loader gearboxes, and in particular to an oil-blocking and air-permeable structure of a loader gearbox. Background Art

[0002] The loader gearbox is one of the core transmission components of the loader. It can change the transmission ratio and expand the torque and speed of the driving wheel. Maintaining a good and stable internal pressure of the gearbox to keep the internal and external pressure difference balanced to prevent the oil from damaging the seal and causing the gearbox to leak oil is an important condition to ensure the normal operation of the gearbox. The regulation of the internal pressure of the gearbox is completed through a breathable structure to ensure the sealing of the internal seals of the gearbox. The existing gearbox breathable structure generally adopts a breathable joint to connect an oil filter device, and then locks the breathable joint to the gearbox, and then locks a "J"-shaped oil baffle plate at the orifice of the breathable joint of the gearbox through open bolts and nuts to block the orifice of the breathable joint, thereby forming a breathable structure; the breathable structure blocks the splashing oil in the gearbox through the oil baffle, and then only allows gas molecules to pass through the external oil filter device, while liquid cannot pass from the inside, and dust cannot enter from the outside, thereby achieving the purpose of waterproof, dustproof, oil-proof and breathable. However, this breathable structure has the following defects:

[0003] 1. There are many parts to be processed, including gearbox housing, breathable joints, oil filter, oil baffle, bolts, nuts, cotter pins and other parts, which results in low production efficiency and high manufacturing cost;

[0004] 2. The ventilation structure has many assembly steps and is complicated, which reduces production efficiency. During maintenance, a variety of tools need to be prepared, which increases maintenance costs and difficulty.

[0005] 3. The filter device is installed externally. When the air pipe of the external vent joint is aged, damaged, or accidentally stuck and deformed, it is easy to cause the internal pressure and heat of the gearbox to increase, resulting in gearbox oil leakage and other faults. Summary of the invention

[0006] The purpose of the present invention is to provide a loader gearbox oil baffle and ventilation structure with a simple and compact structure, efficient processing and assembly, low manufacturing and maintenance costs, and reliable use, so as to solve the problems in the prior art of low processing and assembly efficiency, high manufacturing and maintenance costs due to the large number of processed parts, and gearbox oil leakage caused by aging and damage of the air pipe of the external ventilation joint of the filtering device, or accidental sticking and deformation.

[0007] To achieve the above purpose, the loader gearbox oil-blocking and breathable structure of the present invention includes a shell 1, bolts 2, nuts 3, a box body 4, a breathable net 5, a threaded head 6, a filter plate 7, a breathable membrane assembly 8, a dust-proof pad 9, an outer shell 10, an inner retaining spring 11 and an oil-blocking pipe 12; the breathable membrane assembly 8 is composed of an outer oil-proof membrane 8-1, an intermediate waterproof membrane 8-2, an inner oil-proof membrane 8-3, and a breathable membrane 8-4, the inner oil-proof membrane 8-3 is formed by winding an oil-proof membrane into a closed cylinder, the intermediate waterproof membrane 8-2 is formed by winding a waterproof membrane into a closed cylinder, the outer oil-proof membrane 8-1 is formed by winding an oil-proof membrane into a closed cylinder, the breathable membrane 8-4 is formed by folding the breathable membrane into an "M" shape and cutting it and then unfolding it into an "M" shape, one end of which is bonded to the upper end of the inner cylinder of the inner oil-proof membrane 8-3, and the other end is bonded to the lower end of the inner cylinder of the inner oil-proof membrane 8-3; the dust-proof membrane assembly 8 is composed of an outer oil-proof membrane 8-1, an intermediate waterproof membrane 8-2, an inner oil-proof membrane 8-3, and a breathable membrane 8-4, the inner oil-proof membrane 8-3 is formed by winding an oil-proof membrane into a closed cylinder, the intermediate waterproof membrane 8-2 is formed by winding a waterproof membrane into a closed cylinder, the outer oil-proof membrane 8-1 is formed by winding an oil-proof membrane into a closed cylinder, the breathable membrane 8-4 is formed by folding the breathable membrane into an "M" shape, cutting it, and then unfolding it into an "M" shape, one end of which is bonded to the upper end of the inner cylinder of the inner oil-proof membrane 8-3, and the other end is bond The pad 9 is composed of an upper spacer 9-1 and a lower spacer ring 9-2. The upper spacer 9-1 is disc-shaped, and the lower spacer 9-2 is a spacer that is wrapped around the upper spacer 9-1 to form a closed cylindrical shape. The upper spacer 9-1 is close to the breathable membrane assembly 8 that is inserted into the dust-proof pad 9; one of the breathable nets 5 is clamped on the upper part of the inner hole of the threaded head 6 by an internal retaining spring 11, and the other is locked with an oil retaining tube 12 and pressed under the inner hole of the threaded head 6; the oil retaining tube 12 is welded by a connecting disk 12-1 and a round tube 12-2. The head of the connecting disk 12-1 has a hat shape with external threads. The round tube 12-2 is stamped into a barrel shape by a steel plate and has a rectangular opening on the side of the barrel shape; the lower end of the inner hole of the threaded head 6 locks the connecting disk 12-1 on the oil retaining tube 12, and the upper end of the inner hole of the threaded head 6 is inserted into the breathable membrane assembly 8, and the fitting surface of the upper end of the threaded head 6 where the filter plate 7 is placed is provided with 6 pentagonal breathable holes.

[0008] The inner oil-proof film 8-3 is formed by a 1mm thick 28mm high oil-proof film wrapped in a circle to form a closed cylinder with an outer diameter of φ26mm; the middle waterproof film 8-2 is formed by a 1mm thick 28mm high waterproof film wrapped in a circle to form a closed cylinder with an outer diameter of φ28mm; the outer oil-proof film 8-1 is formed by a 1mm thick 28mm high oil-proof film wrapped in a circle to form a closed cylinder with an outer diameter of φ30mm; the breathable film 8-4 is formed by a 1mm thick 89mm long 24mm wide breathable film folded into an "M" shape, cut to an outer diameter of φ25mm, and then unfolded into an "M" shape.

[0009] The upper spacer 9-1 is in the shape of a disc with an outer diameter of φ30mm and a thickness of 5mm. The lower spacer 9-2 is formed by a spacer with a thickness of 0.5mm and a height of 10mm wrapped around the upper spacer 9-1 to form a closed cylindrical shape with an outer diameter of φ31mm.

[0010] The head of the connecting plate 12-1 is in the shape of a cap with an M18 external thread. The round tube 12-2 is punched into a barrel shape from a 0.5 mm thick steel plate, and a rectangular opening with a length of 20 mm and a height of 10 mm is provided on the side of the barrel shape.

[0011] When the loader is working, most of the oil splashing at the bottom of the gearbox is blocked by the oil blocking pipe 12, and the rest of the oil is blocked by the breathable net 5. The generated oil mist passes through the oil blocking pipe 12, the breathable net 5, and then passes through the filter plate 7 and the breathable membrane assembly 8. The order of magnitude difference between the volume sizes of gas molecules and liquid particles in the oil mist is used to allow the gas molecules to be discharged through the external interface of the threaded head 6, while the liquid cannot pass through, thereby achieving the purpose of preventing oil leakage and allowing air to pass through; and the dust and liquid outside the gearbox entering from the external interface of the threaded head 6 can be blocked by the filter plate 7, the breathable membrane assembly 8 and the dust isolation pad 9, thereby achieving the effect of dustproof and waterproof.

[0012] The above-mentioned loader gearbox oil-blocking and ventilation structure eliminates the ventilation joint external oil filter device and oil baffle plate in the prior art, combines the ventilation device with the oil-blocking device to form an oil-blocking and ventilation assembly and locks it on the gearbox body, and has the following technical characteristics and beneficial effects:

[0013] 1. The present invention eliminates the original oil filter device, air permeable interface, and oil baffle plate, and instead adopts an oil baffle and air permeable assembly that combines an air permeable device with an oil baffle device, and locks it on the gearbox body in a universal screw-on installation manner, which greatly reduces the complexity and tediousness of installation, improves production efficiency, reduces manufacturing costs, and is more cost-effective.

[0014] 2. The relevant parts of the oil-blocking and breathable assembly in the present invention are made of polymer materials that are resistant to chemicals, high and low temperatures, and aging, thereby improving the reliability of the product.

[0015] 3. The present invention has a simple structure, reasonable design, is easy to promote, improves product quality, and is highly practical.

[0016] The loader gearbox oil-blocking and ventilation structure of the present invention solves the problems in the prior art of low processing and assembly efficiency and high manufacturing and maintenance costs caused by many processed parts, as well as the problems of internal oil in the gearbox expanding due to thermal expansion and increased internal pressure caused by aging, damage, and accidental jamming and deformation of the air pipe of the external ventilation joint of the filter device, which leads to oil leakage in the gearbox. It avoids the problem of oil leakage in the gearbox caused by oil damaging the seal due to unbalanced internal and external pressure differences, greatly improves the life of the gearbox and product quality, and reduces equipment maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a main cross-sectional schematic diagram of the oil retaining and ventilation structure of a loader gearbox of the present invention.

[0018] Figure 2 yes Figure 1 AA section view enlarged structural diagram.

[0019] Figure 3 yes Figure 1 Schematic diagram of the interior of the central ventilation structure.

[0020] Figure numerals: shell 1, bolt 2, nut 3, box body 4, air permeable net 5, threaded head 6, filter plate 7, air permeable membrane assembly 8, dust-proof pad 9, outer shell 10, inner retaining spring 11, oil retaining pipe 12. DETAILED DESCRIPTION

[0021] The oil-blocking and ventilating structure of the loader gearbox of the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0022] Figure 1 As shown, the oil-blocking and ventilating structure of the loader gearbox of the present invention comprises a housing 1, bolts 2, nuts 3, a box body 4, a ventilating net 5, a threaded head 6, a filter plate 7, a ventilating membrane assembly 8, a dust-proof pad 9, an outer shell 10, an inner retaining spring 11 and an oil-blocking pipe 12; the ventilating membrane assembly 8 is composed of an outer oil-proof membrane 8-1, an intermediate waterproof membrane 8-2, an inner oil-proof membrane 8-3, and a ventilating membrane 8-4. The inner oil-proof membrane 8-3 is formed by winding an oil-proof membrane into a closed cylindrical shape. The intermediate waterproof membrane 8-2 is formed by winding an oil-proof membrane into a closed cylindrical shape. The membrane 8-2 is formed by a waterproof membrane wrapped around a circle to form a closed cylinder, the outer oil-proof membrane 8-1 is formed by an oil-proof membrane wrapped around a circle to form a closed cylinder, and the breathable membrane 8-4 is formed by a breathable membrane folded into an "M" shape and then cut and then unfolded into an "M" shape, one end of which is bonded to the upper end of the inner cylinder of the inner oil-proof membrane 8-3, and the other end is bonded to the lower end of the inner cylinder of the inner oil-proof membrane 8-3; the dust-proof pad 9 is composed of an upper spacer 9-1 and a lower spacer 9-2, and the upper spacer 9-1 has an outer diameter of The lower spacer 9-2 is a closed cylindrical shape with an outer diameter of φ31mm, which is formed by a spacer with a thickness of 0.5mm and a height of 10mm wrapped around the upper spacer 9-1. The upper spacer 9-1 is close to the breathable membrane assembly 8 inserted into the dustproof pad 9; one of the breathable nets 5 is clamped on the upper part of the inner hole of the threaded head 6 by an inner retaining spring 11, and the other is locked by an oil retaining pipe 12 and pressed against the lower part of the inner hole of the threaded head 6; the oil retaining pipe 12 is composed of a connecting plate 12-1, a round tube 12 -2 is welded, the head of the connecting plate 12-1 is in the shape of a hat with an M18 external thread, the round tube 12-2 is punched into a barrel shape by a 0.5mm thick steel plate, and a rectangular opening with a length of 20mm and a height of 10mm is provided on the side of the barrel shape; the lower end of the inner hole of the threaded head 6 locks the connecting plate 12-1 on the oil retaining tube 12, the upper end of the inner hole of the threaded head 6 is inserted into the breathable membrane assembly 8, and the fitting surface of the upper end of the threaded head 6 where the filter plate 7 is placed is provided with 6 pentagonal breathable holes.

[0023] The assembly steps of the above-mentioned loader gearbox oil retaining and ventilation structure are as follows:

[0024] 1. Assemble one air-permeable net 5 to the upper end of the inner hole of the threaded head 6 with an inner retaining spring 11, and then put another air-permeable net 5 into the lower end of the inner hole of the threaded head 6 and hold it against the oil retaining pipe 12 to lock it;

[0025] 2. After inserting the upper end of the breathable membrane assembly 8 into the dust-proof pad 9, insert the lower end of the breathable membrane assembly 8 into the upper end of the inner hole of the threaded head 6;

[0026] 3. After the filter plate 7 is placed against the external thread on the upper end of the thread head 6, the outer shell 10 is locked on the upper end of the thread head 6 to form a breathable valve assembly;

[0027] 4. Lock the breather valve assembly assembled above onto the box body 4, and then use bolts 2 and nuts 3 to assemble the housing 1 and the box body 4 to complete the assembly of the loader gearbox oil retaining breather structure.

[0028] When the gearbox is working, large drops of oil inside the gearbox are blocked by the oil blocking pipe 12, which prevents the oil from splashing into the inner hole of the threaded head 6, thereby completing the filtration of the internal oil; the oil mist entering the oil blocking pipe 12 from the inside of the gearbox passes through the two air permeable nets 5 in the inner hole of the threaded head 6, completing the first filtration of the internal oil mist; the oil mist then passes through the air permeable membrane assembly 8 and the dust isolation pad 9, completing the second filtration of the internal oil mist; the oil mist then passes through the filter plate 7, completing the third filtration of the internal oil mist. The dust, oil mist, water mist, etc. outside the gearbox pass through the air holes of the threaded head 6 and the filter plate 7 to complete the first filtration of the external dust, oil mist, water mist, etc.; then pass through the breathable membrane assembly 8 and the dust-proof pad 9 to complete the second filtration of the external dust, oil mist, water mist, etc.; then pass through the two breathable nets 5 in the inner hole of the threaded head 6 to complete the third filtration of the external dust, oil mist, water mist, etc.; the internal oil of the gearbox, the dust, oil mist, water mist, etc. outside the gearbox pass through the filtration system composed of the internal filter plate 7 of the breathable valve assembly, the breathable membrane assembly 8, the dust-proof pad 9, the breathable net 5, and the oil blocking pipe 12 to block the macromolecular particles of the oil mist inside the gearbox; block the macromolecular particles such as dust, oil mist, water mist, etc. outside the gearbox outside the gearbox to balance the internal and external pressures of the gearbox assembly and ensure the sealing of the internal seals of the gearbox assembly.

Claims

1. A loader gearbox oil-blocking and air-permeable structure, comprising a housing (1), bolts (2), nuts (3), a housing (4), an air-permeable net (5), a threaded head (6), a filter plate (7), an outer shell (10) and an inner retaining spring (11), Its characteristics are: It also includes a breathable membrane assembly (8), a dustproof pad (9) and an oil-blocking pipe (12); the breathable membrane assembly (8) is composed of an outer oil-proof membrane (8-1), an intermediate waterproof membrane (8-2), an inner oil-proof membrane (8-3) and a breathable membrane (8-4); the inner oil-proof membrane (8-3) is formed by winding an oil-proof membrane into a closed cylindrical shape; the intermediate waterproof membrane (8-2) is formed by winding a waterproof membrane into a closed cylindrical shape; the outer oil-proof membrane (8-1) is formed by winding an oil-proof membrane into a closed cylindrical shape; The oil film is wound around to form a closed cylindrical shape. The air permeable film (8-4) is formed by folding the air permeable film into an "M" shape, cutting it, and then unfolding it into an "M" shape. One end of the air permeable film is bonded to the upper end of the inner cylinder of the inner oil-proof film (8-3), and the other end is bonded to the lower end of the inner cylinder of the inner oil-proof film (8-3). The dust-proof pad (9) is composed of an upper spacer (9-1) and a lower spacer ring (9-2). The upper spacer (9-1) is disc-shaped, and the lower spacer ring (9-2) is a spacer that is wound around the upper spacer (9-1) to form a closed cylindrical shape, and the upper spacer (9-1) is close to the breathable membrane assembly (8) that is inserted into the dustproof pad (9); one of the breathable nets (5) is clamped on the upper part of the inner hole of the threaded head (6) by an inner retaining spring (11), and the other is locked by an oil retaining pipe (12) and pressed against the lower part of the inner hole of the threaded head (6); the oil retaining pipe (12) is welded by a connecting plate (12-1) and a round pipe (12-2) The connecting plate (12-1) has a hat shape with external threads on its head, and the round tube (12-2) is punched into a barrel shape from a steel plate, and a rectangular opening is provided on the side of the barrel shape; the lower end of the inner hole of the threaded head (6) locks the connecting plate (12-1) on the oil retaining tube (12), the upper end of the inner hole of the threaded head (6) is inserted into the breathable membrane assembly (8), and the fitting surface of the upper end of the threaded head (6) on which the filter plate (7) is placed is provided with 6 pentagonal breathable holes.

2. The loader gearbox oil-blocking and breathable structure as claimed in claim 1, Its characteristics are: The inner oil-proof film (8-3) is formed by a 1mm thick 28mm high oil-proof film wound around once to form a closed cylinder with an outer diameter of φ26mm; the middle waterproof film (8-2) is formed by a 1mm thick 28mm high waterproof film wound around once to form a closed cylinder with an outer diameter of φ28mm; the outer oil-proof film (8-1) is formed by a 1mm thick 28mm high oil-proof film wound around once to form a closed cylinder with an outer diameter of φ30mm; the breathable film (8-4) is formed by a 1mm thick 89mm long 24mm wide breathable film folded into an "M" shape, cut to an outer diameter of φ25mm, and then unfolded into an "M" shape.

3. The loader gearbox oil-blocking and breathable structure as claimed in claim 1, Its characteristics are: The upper spacer (9-1) is in the shape of a disc with an outer diameter of φ30mm and a thickness of 5mm. The lower spacer (9-2) is formed by a spacer with a thickness of 0.5mm and a height of 10mm wrapped around the upper spacer (9-1) to form a closed cylindrical shape with an outer diameter of φ31mm.

4. The loader gearbox oil-blocking and ventilating structure as claimed in claim 1, Its characteristics are: The head of the connection plate (12-1) is in the shape of a cap with an M18 external thread. The round tube (12-2) is punched into a barrel shape from a 0.5 mm thick steel plate, and a rectangular opening with a length of 20 mm and a height of 10 mm is provided on the side of the barrel shape.

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