Respirator structure of gearbox of loading machine

Abstract

The utility model discloses a loader gearbox respirator structure which comprises a hollow bolt, a combined gasket, a transition sleeve, a bent pipe, a nut, a filter screen and a steel wire ball. Four holes evenly distributed in the circumferential direction are formed in the position, matched with an inner cavity of the transition sleeve, of the upper portion of the hollow bolt, and the four holes are communicated with a center hole of the hollow bolt. The transition sleeve is drum-shaped in appearance and hollowed out, a hole communicated with the lower end of the inner hole of the bent pipe is formed in one side face of the transition sleeve, and the transition sleeve and the bent pipe are welded into a whole; an external thread is arranged at the upper end of the bent pipe; the nut is provided with internal threads, an inner cavity of the nut is hollowed out and filled with the steel wire ball, an air hole is drilled in the outer edge of the lower end of the nut, the nut is connected with the upper end of the bent pipe through the threads, and the filter screen is assembled between the nut and the bent pipe. And the transition sleeve is locked on the box body boss through the hollow bolt, the upper combined gasket and the lower combined gasket. When the gearbox works, the pressure difference between the inside and the outside of the box body is kept to prevent the sealing piece of the gearbox from leaking oil, and meanwhile, the breather can be effectively prevented from leaking oil.

Description

Technical Field

[0001] The utility model relates to the technical field of a loader gearbox assembly, in particular to a loader gearbox breather structure. Background Art

[0002] The loader gearbox is the core component of the loader transmission system. It can change the transmission ratio and increase the torque and speed of the driving wheel. The loader gearbox is a hydraulic shift gearbox. The oil pan at the bottom of the box is filled with a large amount of oil to ensure the normal operation of the movement and the lubrication of various gears and bearing parts. When the gearbox is working, as the internal temperature of the gearbox rises, the pressure in the box cavity also rises; and when it stops working, as the internal temperature of the gearbox cools, the pressure in the box cavity also decreases. The gearbox breather is an important part for regulating the pressure difference between the inside and outside of the gearbox. It must maintain a good and stable internal pressure of the gearbox, balance the internal and external pressure difference, and prevent the internal pressure of the gearbox from being too high, causing oil leakage of the seal; at the same time, it must also effectively prevent the internal oil of the gearbox from overflowing from the breather hole of the breather and causing the breather to leak oil. The existing loader gearbox breather generally adopts a structure in which the breathable nut is directly locked on the hollow bolt. Because the breathable nut is close to the hollow bolt, it is difficult to take into account both the breathability effect and the oil leakage prevention. Summary of the invention

[0003] The utility model aims to provide a loader gearbox breather structure which has a simple and compact structure, low manufacturing and maintenance costs, and reliable use, so that when the gearbox is operating, the pressure difference between the inside and outside of the box is maintained to prevent the gearbox seal from leaking oil, and the breather can also be effectively prevented from leaking oil.

[0004] To achieve the above purpose, the utility model loader gearbox breather structure includes a hollow bolt 1, a combination washer 2, a transition sleeve 3, a bent pipe 4, a nut 5, a filter 6 and a steel ball 7; the upper part of the hollow bolt 1 is provided with four holes evenly distributed along the circumferential direction at the position where it cooperates with the inner cavity of the transition sleeve 3, and the four holes are connected with the center hole of the hollow bolt 1; the appearance of the transition sleeve 3 is drum-shaped, the interior is hollowed out, and a hole connected to the lower end of the inner hole of the bent pipe 4 is provided on one side surface thereof, and the two are welded as a whole; the upper end of the bent pipe 4 is provided with an external thread; the nut 5 is provided with an internal thread, the inner cavity is hollowed out and filled with a steel ball 7, and the outer edge of the lower end of the nut 5 is drilled with a vent hole, the nut 5 is connected to the upper end of the bent pipe 4 by a thread, and a filter 6 is installed between the two; the transition sleeve 3 is locked on the box body boss 8 by the hollow bolt 1 and the upper and lower combination washers 2.

[0005] The above-mentioned loader gearbox breather structure has the following technical features and beneficial effects:

[0006] 1. It can effectively balance the pressure difference between the inside and outside of the gearbox before and after it works, ensuring the normal operation of the seal without oil leakage;

[0007] 2. It can effectively prevent the oil inside the gearbox from overflowing from the breather vent and causing the breather to leak oil.

[0008] 3. Simple and compact structure, low production and maintenance costs, and reliable use. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 The utility model is a schematic diagram of the structure of a loader gearbox breather.

[0010] Figure numerals: hollow bolt 1, combination washer 2, transition sleeve 3, elbow 4, nut 5, filter screen 6, steel wool 7, box boss 8. DETAILED DESCRIPTION

[0011] The structure of the loader gearbox breather of the utility model is further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0012] Figure 1 As shown, the utility model loader gearbox breather structure includes a hollow bolt 1, a combination washer 2, a transition sleeve 3, a bent pipe 4, a nut 5, a filter 6 and a steel ball 7; the upper part of the hollow bolt 1 is provided with four holes evenly distributed along the circumferential direction at the position where it cooperates with the inner cavity of the transition sleeve 3, and the four holes are connected with the center hole of the hollow bolt 1; the appearance of the transition sleeve 3 is drum-shaped, the inside is hollowed out, and a hole connected to the lower end of the inner hole of the bent pipe 4 is provided on one side surface thereof, and the two are welded as one; the upper end of the bent pipe 4 is provided with an external thread; the nut 5 is provided with an internal thread, and its inner cavity is hollowed out and filled with a steel ball 7, and the outer edge of the lower end of the nut 5 is drilled with a ventilation hole, the nut 5 is connected to the upper end of the bent pipe 4 by a thread, and a filter 6 is installed between the two; the transition sleeve 3 is locked on the box body boss 8 by the hollow bolt 1 and the upper and lower combination washers 2.

[0013] When assembling the above-mentioned loader gearbox breather structure, first fill the nut 5 with a steel ball 7, then install the filter 6 into the threaded hole in the nut 5, and then lock the nut 5 on the external thread at the upper end of the elbow 4; then insert a combined washer 2 into the hollow bolt 1, and then insert the transition sleeve 3 and the elbow 4 welded as one into the hollow bolt 1, and assemble another combined washer 2 on the other end face of the transition sleeve 3; finally, assemble and lock the breather assembly on the box body boss 8.

[0014] The utility model has the advantages of simple and compact structure, low manufacturing and maintenance cost, and reliable use, and can effectively prevent the breather from leaking oil while maintaining the pressure difference between the inside and outside of the box to prevent the oil leakage of the gearbox seal during gearbox operation.

Claims

1. A loader gearbox breather structure, characterized by: It comprises a hollow bolt (1), a combined washer (2), a transition sleeve (3), a bent pipe (4), a nut (5), a filter screen (6) and a steel ball (7); the upper portion of the hollow bolt (1) is provided with four holes evenly distributed along the circumference at the position where it cooperates with the inner cavity of the transition sleeve (3), and the four holes are connected with the central hole of the hollow bolt (1); the transition sleeve (3) has a drum-like appearance, is hollowed out inside, and is provided with a filter screen (6) on one side thereof, which is in contact with the lower end of the inner hole of the bent pipe (4). The two are welded together; the upper end of the elbow (4) is provided with an external thread; the nut (5) is provided with an internal thread, the inner cavity of which is hollowed out and filled with a steel ball (7); the outer edge of the lower end of the nut (5) is drilled with a vent hole, the nut (5) is connected to the upper end of the elbow (4) by a thread, and a filter (6) is installed between the two; the transition sleeve (3) is locked on the box body boss (8) by a hollow bolt (1) and two upper and lower combined washers (2).

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