Transmission shaft with exhaust structure

Abstract

The transmission shaft with the exhaust structure comprises a flange yoke, a shaft tube, a sliding sleeve and a spline shaft, a closed cavity is formed among the flange yoke, the shaft tube, the sliding sleeve and the spline shaft, an exhaust hole used for communicating the closed cavity with the outside is formed in the flange yoke, and an exhaust valve used for opening and closing the exhaust hole is arranged in the exhaust hole. When the spline shaft slides in the sliding sleeve, air in the closed cavity generates negative pressure or positive pressure, the closed cavity opens or closes the exhaust hole through the exhaust valve to exchange with outside air, it is ensured that the air pressure in the closed cavity is stable, resistance caused by the air pressure in the closed cavity is avoided when the spline shaft is compressed and stretched to slide, and sliding is smoother; the exhaust valve is arranged in the exhaust hole, so that the exhaust hole cannot be blocked by external dust, impurities and the like; by using a set of structure which is good in sealing effect, closed inside and adjustable in volume, the purposes of completely sealing the closed cavity and keeping the air pressure balance of the cavity are achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of transmission shafts, in particular to a transmission shaft with an exhaust structure. Background Art

[0002] In commercial vehicles, the coordinates of the bridge input point will change due to changes in load and road impact under different working conditions, so the drive shaft connected to the bridge is usually designed with a telescopic spline structure.

[0003] The existing transmission shaft spline telescopic part is an ordinary closed dustproof structure. When it is telescoped, the internal air pressure sometimes produces positive pressure and sometimes produces negative pressure. Because the volume of its internal space changes during telescoped, the internal air pressure cannot maintain balance with the outside world, resulting in a resistance during compression or telescoped, resulting in poor sliding.

[0004] In view of this, the inventor of this case conducted in-depth research on the above-mentioned issues, which resulted in this case. Utility Model Content

[0005] The purpose of the utility model is to overcome the deficiencies of the prior art and provide a transmission shaft with an exhaust structure.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solution:

[0007] A transmission shaft with an exhaust structure comprises a shaft tube, a sliding sleeve connected to the shaft tube, and a spline shaft slidably arranged on the sliding sleeve, the spline shaft being telescopically sleeved on the sliding sleeve to form a telescopic pair, a flange fork being fixedly connected to one end of the shaft tube away from the sliding sleeve, a closed cavity being formed among the flange fork, the shaft tube, the sliding sleeve and the spline shaft, an exhaust hole for connecting the closed cavity with the outside world is provided on the flange fork, an exhaust valve for opening and closing the exhaust hole is provided in the exhaust hole, the spline shaft slides in the sliding sleeve, so that negative pressure or positive pressure is generated in the gas in the closed cavity, the closed cavity exchanges air with the outside air by opening or closing the exhaust hole through the exhaust valve, thereby ensuring that the air pressure in the closed cavity is stable.

[0008] Preferably, the exhaust valve includes a first connecting member and a second connecting member, the first connecting member is relatively fixedly connected to the exhaust hole, the first connecting member is provided with a through hole passing through both sides thereof, the second connecting member includes a connecting rod movably inserted into the through hole and a first connecting head and a second connecting head connected to both ends of the connecting rod, the first connecting head and the second connecting head are respectively arranged at both ends of the through hole, the first connecting head is arranged away from the enclosed cavity, and the second connecting head is arranged close to the enclosed cavity, and the diameters of the two connecting heads are larger than the diameter of the through hole.

[0009] Preferably, the exhaust valve further comprises a spring sleeved on the outside of the connecting rod, a step is provided at one end of the through hole away from the closed cavity, one end of the spring abuts against the step, and the other end abuts against the second connector.

[0010] Preferably, an exhaust passage is formed between the step and the connecting rod.

[0011] Preferably, outer surfaces of the spline shaft and the sliding sleeve are covered with a sheath tube oil seal assembly, and the connection between the spline shaft and the sliding sleeve is covered inside by the sheath tube oil seal assembly.

[0012] Preferably, the sleeve tube oil seal assembly includes a sleeve tube and an oil seal, one end of the sleeve tube is pressed into the spline shaft stop and reinforced by a rolling extrusion process, the oil seal is arranged on the sleeve tube, the outer circle of the oil seal is pressed into the sleeve tube and then riveted to reinforce it, and the sleeve tube oil seal assembly is slidably sleeved on the sliding sleeve through the inner cutting edge of the oil seal.

[0013] Preferably, sealing rings are provided between the flange fork and the shaft tube, between the shaft tube and the sliding sleeve, and between the spline shaft and the sleeve tube.

[0014] Preferably, the flange fork, the shaft tube, the sliding sleeve and the spline shaft are all made of steel.

[0015] By adopting the above-mentioned design scheme, the beneficial effects of the utility model are as follows: when the spline shaft slides in the sliding sleeve, the gas in the closed cavity generates negative pressure or positive pressure, and the closed cavity opens or closes the exhaust hole through the exhaust valve to exchange with the outside air, ensuring that the air pressure in the closed cavity is stable, and solving the problem of no resistance caused by the air pressure in the closed cavity when the spline shaft is compressed and stretched to slide, so that the sliding is smoother; by arranging an exhaust valve in the exhaust hole, the exhaust hole will not be blocked by external dust, impurities, etc.; the utility model achieves the purpose of completely sealing the closed cavity and maintaining its air pressure balance by using a set of structures with good sealing effect, internal closure and adjustable volume. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the structure of the utility model;

[0017] Figure 2 It is a structural schematic diagram of the stretching process of the spline shaft of the utility model;

[0018] Figure 3 It is a structural schematic diagram of the compression process of the spline shaft of the utility model;

[0019] In the figure: shaft tube 1, sliding sleeve 2, spline shaft 3, flange fork 4, exhaust hole 41, closed cavity 5, exhaust valve 6, first connecting piece 61, through hole 611, step 612, second connecting piece 62, first connecting head 621, second connecting head 622, connecting rod 623, exhaust channel 624, spring 63, sheath tube 71, oil seal 72, sealing ring 8. DETAILED DESCRIPTION

[0020] The following is a clear and complete description of the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] Reference Figures 1 to 3

[0022] A transmission shaft with an exhaust structure comprises a shaft tube 1, a sliding sleeve 2 connected to the shaft tube 1, and a spline shaft 3 slidably arranged on the sliding sleeve 2, the spline shaft 3 is telescopically sleeved on the sliding sleeve 2 to form a telescopic pair, a flange fork 4 is fixedly connected to one end of the shaft tube 1 away from the sliding sleeve 2, and a closed cavity 5 is formed between the flange fork 4, the shaft tube 1, the sliding sleeve 2 and the spline shaft 3. Preferably, the shaft tube 1, the sliding sleeve 2, the spline shaft 3 and the flange fork 4 are all made of steel. A sealing ring 8 is arranged between the flange fork 4 and the shaft tube 1, between the shaft tube 1 and the sliding sleeve 2, and between the spline shaft 3 and the sleeve tube 71 (which will be described in detail below).

[0023] The flange fork 4 is provided with an exhaust hole 41 for connecting the closed cavity 5 with the outside world, and an exhaust valve 6 for opening and closing the exhaust hole 41 is provided in the exhaust hole 41. The spline shaft 3 slides in the sliding sleeve 2, so that the gas in the closed cavity 5 generates negative pressure or positive pressure, and the closed cavity 5 exchanges with the outside air through the exhaust hole 41 opened or closed by the exhaust valve 6, ensuring that the air pressure in the closed cavity 5 is stable. Stretching or compressing the spline shaft 3 generates negative pressure or positive pressure in the closed cavity 5, and the closed cavity 5 exchanges with the outside air through the exhaust hole 41, ensuring that the air pressure in the closed cavity 5 is stable, and at the same time, the spline shaft 3 slides smoothly in the spline sleeve 2. At the same time, according to the positive and negative pressure of the closed cavity 5, the exhaust valve 6 can automatically open and close the exhaust hole 41, so that the interior will not be blocked by external dust, impurities, etc.

[0024] When the transmission shaft is working, the spline shaft 3 is pulled out (the overall length becomes longer), the air pressure in the closed cavity 5 is lower than the external air pressure, and the negative pressure in the closed cavity 5 causes the exhaust valve 6 to close; the spline shaft 3 is compressed (the overall length becomes shorter), the air pressure in the closed cavity 5 is higher than the external air pressure, and the negative pressure in the closed cavity 5 causes the exhaust valve 6 to open.

[0025] Further, the exhaust valve 6 includes a first connecting member 61 and a second connecting member 62. The first connecting member 61 is fixedly connected to the exhaust hole 41 by threads. The first connecting member 61 is provided with a through hole 611 running through both sides thereof. The through hole 611, the exhaust hole 41 and the closed cavity 5 are communicated. The second connecting member 62 includes a connecting rod 623 movably inserted into the through hole 611 and a first connecting head 621 and a second connecting head 622 connected to both ends of the connecting rod 623. The first connecting head 621 and the second connecting head 622 are respectively arranged at both ends of the through hole 611. The first connecting head 621 is arranged away from the closed cavity 5, and the second connecting head 622 is arranged close to the closed cavity 5. The diameters of the first connecting head 621 and the second connecting head 622 are both larger than the diameter of the through hole 611, so that the first connecting member 61 is restricted by the first connecting head 621 and the second connecting head 622 to move in the through hole 611. It is worth noting that the second connecting member 62 in this embodiment may also be a combination of two interconnected connecting members, so that it can be installed or removed from both ends of the through hole 621 .

[0026] Further, the exhaust valve 6 also includes a spring 63 sleeved on the outside of the connecting rod 623, and a step 612 is provided at one end of the through hole 611 away from the closed cavity 5. One end of the spring 63 abuts on the step 612, and the other end abuts on the second connector 622. An exhaust passage 624 is formed between the step 612 and the connecting rod 623. When the spline shaft 3 is pulled out (the overall length becomes longer), the air pressure in the closed cavity 5 is lower than the external air pressure, and the negative pressure in the closed cavity 5 closes the exhaust valve 6; or according to the restoring force of the spring 63 itself, the spring 63 provides an inward pressure to the second connector 622 of the second connecting member 62, so that the second connector 622 drives the connecting rod 623 and the first connector 621 to move along the direction of the closed cavity 5, until the first connector 621 abuts on the outer wall of the first connecting member 61, that is, the through hole 611 connected to the closed cavity 5 is closed, and the connection between the closed cavity 5 and the outside is closed.

[0027] Furthermore, the outer surfaces of the spline shaft 3 and the sliding sleeve 2 are covered with a sheath tube oil seal assembly, and the connection between the spline shaft 3 and the sliding sleeve 2 is covered by the sheath tube oil seal assembly. Specifically, the sheath tube oil seal assembly includes a sheath tube 71 and an oil seal 72. One end of the sheath tube 71 is pressed into the stopper of the spline shaft 3 and reinforced by a rolling extrusion process. The oil seal 72 is arranged on the sheath tube 71. The outer circle of the oil seal 72 is pressed into the sheath tube 71 and then riveted to reinforce the edge. The sheath tube oil seal assembly is connected to the sliding sleeve 2 through the inner edge of the oil seal 72. A maintenance-free structure is formed on the surface of the spline shaft 3 and the sliding sleeve 2. Grease is added once and no subsequent maintenance is required. It has the characteristics of good lubrication performance and environmental protection.

[0028] The working principle of the utility model is as follows: when the spline shaft 3 moves rightward and is compressed in the sliding sleeve 2 (such as Figure 3 As shown in FIG. 1 ), the volume of the closed cavity 5 is reduced, the air pressure is increased, the air in the closed cavity 5 is squeezed toward the exhaust hole 41, and the second connecting member 62 is pushed outward, thereby opening the exhaust passage 624, forcing the air in the closed cavity 5 to be discharged into the outside atmosphere through the exhaust passage 624, and maintaining the air pressure inside and outside the closed cavity 5 equal; on the contrary, when the spline shaft 3 moves to the left in the sleeve 2 and stretches (as shown in FIG. Figure 2 As shown in the figure, the volume in the closed cavity 5 increases, the air pressure decreases, the outside space squeezes toward the exhaust hole 41, and pushes the second connecting member 62 to move inward, thereby opening the exhaust channel 624, forcing the outside air to enter the closed cavity 5 through the exhaust channel 624, and maintaining the air pressure inside and outside the closed cavity 5 equal; of course, there is another situation, such as when the transmission shaft is not working, the spring 63, based on its own restoring force, provides inward pressure to the second connecting head 622 of the second connecting member 62, so that the second connecting head 622 drives the connecting rod 623 and the first connecting head 621 to move along the direction of the closed cavity 5, until the first connecting head 621 abuts against the outer wall of the first connecting member 61, that is, the through hole 611 connected to the closed cavity 5 is closed, and the connection between the closed cavity 5 and the outside is closed to avoid being blocked by external dust, impurities, etc.

[0029] By adopting the above-mentioned design scheme, the beneficial effects of the utility model are as follows: when the spline shaft 3 slides in the sliding sleeve 2, the gas in the closed cavity 5 generates negative pressure or positive pressure, and the closed cavity 5 opens or closes the exhaust hole 41 through the exhaust valve 6 to exchange with the outside air, ensuring that the air pressure in the closed cavity 5 is stable, and the spline shaft 3 is not subjected to resistance caused by the air pressure in the closed cavity 5 when sliding in compression and tension in the sliding sleeve 2, so that the sliding is smoother; by arranging the exhaust valve 6 in the exhaust hole 41, that is, the exhaust hole 41 will not be blocked by external dust, impurities, etc.; the utility model achieves the purpose of completely sealing the closed cavity 5 and maintaining its air pressure balance by using a set of structures with good sealing effect, internal closure and adjustable volume.

[0030] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A transmission shaft with an exhaust structure, comprising a shaft tube, a sliding sleeve connected to the shaft tube, and a spline shaft slidably arranged on the sliding sleeve, wherein the spline shaft is telescopically sleeved on the sliding sleeve to form a telescopic pair, and a flange fork is fixedly connected to one end of the shaft tube away from the sliding sleeve, and a closed cavity is formed between the flange fork, the shaft tube, the sliding sleeve and the spline shaft, characterized in that: The flange fork is provided with an exhaust hole for connecting the closed cavity with the outside world, and the exhaust hole is provided with an exhaust valve for opening and closing the exhaust hole. The spline shaft slides in the sliding sleeve, so that the gas in the closed cavity generates negative pressure or positive pressure. The closed cavity opens or closes the exhaust hole through the exhaust valve to exchange air with the outside world, ensuring that the air pressure in the closed cavity is stable.

2. The transmission shaft with an exhaust structure according to claim 1, characterized in that: The exhaust valve includes a first connecting member and a second connecting member, the first connecting member is relatively fixedly connected to the exhaust hole, the first connecting member is provided with a through hole running through both sides thereof, the second connecting member includes a connecting rod movably inserted into the through hole and a first connecting head and a second connecting head connected to both ends of the connecting rod, the first connecting head and the second connecting head are respectively arranged at both ends of the through hole, the first connecting head is arranged away from the enclosed cavity, and the second connecting head is arranged close to the enclosed cavity, and the diameters of the two connecting heads are larger than the diameter of the through hole.

3. The transmission shaft with an exhaust structure according to claim 2, characterized in that: The exhaust valve also includes a spring sleeved on the outside of the connecting rod, and a step is provided at one end of the through hole away from the closed cavity. One end of the spring abuts against the step, and the other end abuts against the second connector.

4. The transmission shaft with an exhaust structure according to claim 3, characterized in that: An exhaust passage is formed between the step and the connecting rod.

5. The transmission shaft with an exhaust structure according to claim 1, characterized in that: The outer surfaces of the spline shaft and the sliding sleeve are covered with a sheath tube oil seal assembly, and the connection between the spline shaft and the sliding sleeve is covered inside by the sheath tube oil seal assembly.

6. The transmission shaft with an exhaust structure according to claim 5, characterized in that: The sleeve tube oil seal assembly includes a sleeve tube and an oil seal. One end of the sleeve tube is pressed into the spline shaft stop and reinforced by a rolling extrusion process. The oil seal is arranged on the sleeve tube. The outer circle of the oil seal is pressed into the sleeve tube and then riveted to reinforce it. The sleeve tube oil seal assembly is slidably sleeved on the sliding sleeve through the inner cutting edge of the oil seal.

7. The transmission shaft with an exhaust structure according to claim 6, characterized in that: Sealing rings are arranged between the flange fork and the shaft tube, between the shaft tube and the sliding sleeve, and between the spline shaft and the sleeve tube.

8. The transmission shaft with an exhaust structure according to claim 1, characterized in that: The flange fork, the shaft tube, the sliding sleeve and the spline shaft are all made of steel.

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