Drive shaft and vehicle

Abstract

The embodiment of the application provides a transmission shaft and a vehicle, relates to the technical field of transmission mechanisms, and aims to solve the problem of how to slow down the abrasion of the sliding contact part between the inner shaft and the outer shaft; wherein the transmission shaft comprises an outer shaft and an inner shaft; the outer shaft is provided with a matching hole, the inner shaft is sleeved in the matching hole, the outer shaft and the inner shaft can transmit torque and can relatively stretch and slide; the inner shaft comprises a first end part opposite to the hole bottom of the matching hole, a region between the first end part and the hole bottom of the matching hole forms a first cavity, a lubricant is arranged in the first cavity, the outer shaft is provided with a lubricant flow channel, an inlet of the lubricant flow channel is communicated with the first cavity, and an outlet of the lubricant flow channel is directed to the sliding matching area between the inner shaft and the outer shaft; a cavity wall of the first cavity is provided with a first one-way valve, the first one-way valve is used for inputting external air into the first cavity and blocking the air in the first cavity from being discharged.

Description

Technical Field

[0001] This utility model relates to the field of transmission mechanism technology, and in particular to a transmission shaft; this utility model also relates to a vehicle equipped with the transmission shaft. Background Technology

[0002] A driveshaft is a widely used transmission mechanism. Taking a vehicle equipped with a driveshaft as an example, the engine's torque is transmitted to the transfer case, which then transmits the torque to the reducer via the driveshaft. From there, the torque and motion are transmitted to the wheels through the final drive and drive shaft, driving the vehicle to move.

[0003] The drive shaft consists of an outer shaft and an inner shaft. The outer shaft is fitted over the inner shaft, and the inner and outer shafts are slidably connected. Generally, lubricant is provided at the sliding contact area between the inner and outer shafts to prevent wear. However, during prolonged operation, the relative sliding and contraction of the inner and outer shafts can squeeze out the lubricant from the sliding contact area, leading to insufficient lubrication and subsequent wear. Utility Model Content

[0004] In view of this, the present invention aims to provide a transmission shaft to solve the problem of how to reduce wear at the sliding contact points between the inner and outer shafts.

[0005] To achieve the above objectives, the technical solution of this utility model is implemented as follows: The transmission shaft provided in this embodiment includes an outer shaft and an inner shaft. The outer shaft has a mating hole, and the inner shaft is sleeved in the mating hole. The outer shaft and the inner shaft can transmit torque and can slide relative to each other. The inner shaft includes a first end opposite to the bottom of the mating hole. The area between the first end and the bottom of the mating hole forms a first cavity. The first cavity contains a lubricant. The outer shaft has a lubricant channel. The inlet of the lubricant channel communicates with the first cavity, and the outlet of the lubricant channel faces the sliding mating area between the inner shaft and the outer shaft. The cavity wall of the first cavity is provided with a first one-way valve. The first one-way valve is used to allow outside air to enter the first cavity while blocking the air in the first cavity from escaping.

[0006] In some embodiments, the wall of the mating hole is provided with a groove, and the outer periphery of the inner shaft is provided with a protrusion. The protrusion and the groove are slidably connected along the axial direction of the inner shaft. In this way, the inner shaft and the outer shaft can slide relative to each other during torque transmission by means of the sliding engagement between the protrusion and the groove.

[0007] In some embodiments, the mating hole is a spline hole, with the keyway forming a groove and the protrusion forming key teeth. In this way, a large torque can be transmitted by the mating of the inner and outer shafts through the key teeth and spline hole.

[0008] In some embodiments, the wall of the mating hole is provided with a lubricant collection groove, which is annular around the axis of the outer shaft, and the inlet of the lubricant flow channel communicates with the lubricant collection groove. In this way, during the rotation of the drive shaft, the lubricant will flow to the lubricant collection groove under the action of centrifugal force, and can then be delivered to the part that needs lubrication through the inlet of the lubricant flow channel.

[0009] In some embodiments, the end of the hole wall facing the bottom of the hole is the bottom end of the hole wall, and the inlet of the lubricant flow channel is located at the bottom end of the hole wall. In this way, during the extension and retraction of the inner shaft relative to the outer shaft, the inner shaft will push the lubricant adhering to the hole wall of the hole towards the bottom of the hole, thereby allowing the lubricant to be better collected in the lubricant collection tank.

[0010] In some embodiments, the wall of the mating hole is further provided with a lubricant storage tank, and the outlet of the lubricant flow channel is located at the bottom of the lubricant storage tank, with the opening of the lubricant storage tank facing the outer peripheral surface of the inner shaft. In this way, the lubricant discharged through the outlet of the lubricant flow channel can lubricate the area between the outer peripheral surface of the inner shaft and the wall of the mating hole.

[0011] In some embodiments, the lubricant reservoir is annular, surrounding the axis of the outer shaft. This allows lubricant discharged through the outlet of the lubricant channel to fill the lubricant reservoir, thereby facilitating the lubricant in the reservoir to lubricate the area between the outer peripheral surface of the inner shaft and the wall of the mating hole along the circumferential direction of the inner shaft.

[0012] In some embodiments, there are multiple lubricant reservoirs, which are spaced apart along the axial direction of the outer shaft. This increases the number of lubricant reservoirs, thereby improving the lubrication effect on the area between the outer circumferential surface of the inner shaft and the wall of the mating hole.

[0013] In some embodiments, a plurality of lubricant channels are provided, and the plurality of lubricant channels are circumferentially distributed around the axis of the outer shaft. This allows the lubricant discharged through the lubricant channels to better fill the lubricant storage tank.

[0014] In some embodiments, the drive shaft further includes a telescopic sleeve, which includes a second end and a third end. The second end is sleeved on the outer shaft, and the third end is sleeved on the inner shaft. The area between the telescopic sleeve and the inner shaft forms a second cavity. The first cavity and the second cavity are connected by a fitting clearance between the inner shaft and the outer shaft. The cavity wall of the second cavity is provided with a second one-way valve, which is used to allow air to be discharged from the second cavity while preventing outside air from entering the second cavity. In this way, the second one-way valve can be used to discharge air from the second cavity to avoid excessive air pressure in the telescopic sleeve, which could damage the telescopic sleeve.

[0015] The above-mentioned technical solutions adopted in the embodiments of this utility model can achieve the following beneficial effects: In an embodiment of this utility model, the outer shaft and the inner shaft are capable of transmitting torque and can slide relative to each other. The area between the first end of the inner shaft and the bottom of the mating hole forms a first cavity, and a lubricant is provided in the first cavity.

[0016] During the shortening of the drive shaft (i.e., the inner shaft moves closer to the bottom of the mating hole), the volume of the first cavity decreases, and the air pressure inside the first cavity increases. The gas in the first cavity can drive the lubricant near the inlet of the lubricant channel to be transported through the lubricant channel to the sliding mating area between the inner and outer shafts. In this way, the lubricant is used to lubricate the sliding contact parts between the inner and outer shafts, thereby reducing the wear of the sliding contact parts between the inner and outer shafts.

[0017] As the drive shaft extends (i.e., the inner shaft moves further away from the bottom of the mating hole), the volume of the first cavity increases, and the air pressure inside the first cavity decreases. Outside air is then replenished into the first cavity via the first one-way valve. This prevents the lubricant in the sliding contact area between the inner and outer shafts from being "drawn back" into the first cavity due to the reduced air pressure. Thus, during the drive shaft extension, the lubricant in the sliding contact area between the inner and outer shafts remains adhered, maintaining lubrication and reducing wear on the sliding contact points.

[0018] Another objective of this invention is to provide a vehicle in which any of the drive shafts described above is provided.

[0019] The vehicle described in this utility model has the same beneficial effects as the aforementioned drive shaft, and will not be repeated here.

[0020] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this utility model or related technologies, the drawings used in the description of the embodiments or related technologies will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 A partial schematic diagram of a transmission shaft provided for an embodiment of this utility model; Figure 2 for Figure 1 A half-sectional view of the drive shaft shown in the image; Figure 3 for Figure 2 A schematic diagram of region M of the drive shaft is shown in the figure; Figure 4 for Figure 3 The cross-sectional view of the drive shaft along the section passing through line AA is shown in the figure; Figure 5 for Figure 3 The image shows a cross-sectional view of the drive shaft along the section passing through line BB; Figure 6 for Figure 3 The diagram shown depicts the drive shaft in a shortened state. Figure 7 for Figure 3 The diagram shown shows the drive shaft in an extended state; Figure 8 A schematic diagram of a first check valve provided for an embodiment of this utility model; Figure 9 for Figure 2 A schematic diagram of region N of the drive shaft is shown in the figure; Figure 10 This is a schematic diagram of a second check valve provided for an embodiment of the present invention.

[0023] Explanation of reference numerals in the attached figures: 1-Drive shaft; 100 - Outer shaft; 110 - Mating hole; 111 - Bottom of the mating hole; 120 - Groove; 130 - Lubricant channel; 131 - Inlet of the lubricant channel; 132 - Outlet of the lubricant channel; 140 - Lubricant collection tank; 150 - Bottom end of the hole wall; 160 - Lubricant storage tank; 170 - End cap; 200 - Inner shaft; 210 - Protrusion; 220 - First end; 230 - Vent hole; 240 - Mounting hole; 310 - First cavity; 320 - Lubricant; 330 - Sliding fit area; 410 - First check valve; 411 - First valve body; 412 - Air inlet; 413 - First valve core; 414 - First elastic element; 420 - Second check valve; 421 - Second valve body; 422 - Vent port; 423 - Second valve core; 424 - Second elastic element; 500 - Telescopic sheath; 510 - Second end; 520 - Third end; 600 - Second cavity; 700-Universal Joint. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below in conjunction with specific embodiments and corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0025] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0026] Furthermore, although the terminology used in this invention is selected from commonly known and used terms, some terms mentioned in this specification may have been selected by the inventor in his or her judgment, and their detailed meanings are explained in the relevant sections of the description herein.

[0027] Furthermore, it is required that this utility model be understood not only through the actual terminology used, but also through the meaning implied by each term.

[0028] The technical solutions provided by the various embodiments of this utility model are described in detail below with reference to the accompanying drawings.

[0029] This utility model provides a drive shaft. (See reference...) Figures 1 to 10 The transmission shaft 1 provided in this embodiment of the present invention includes an outer shaft 100 and an inner shaft 200.

[0030] The outer shaft 100 is provided with a mating hole 110, and the inner shaft 200 is sleeved in the mating hole 110. The outer shaft 100 and the inner shaft 200 can transmit torque and can slide relative to each other.

[0031] The inner shaft 200 includes a first end portion 220 opposite to the bottom 111 of the mating hole 110, and the region between the first end portion 220 and the bottom 111 of the mating hole 110 forms a first cavity 310. Exemplarily, with... Figure 3Taking the shown orientation as an example, the outer shaft 100 has a mating hole 110 with its opening facing right. That is, the opening of the mating hole 110 faces right, and the bottom 111 of the mating hole 110 is on the left side of the opening. The inner shaft 200 is sleeved inside the mating hole 110, with the left end of the inner shaft 200 opposite to the bottom 111 of the mating hole 110. That is, the left end of the inner shaft 200 is the first end 220. The area between the left end of the inner shaft 200 and the bottom 111 on the right side of the mating hole 110 forms a first cavity 310.

[0032] The first cavity 310 is provided with a lubricant 320. Exemplarily, the lubricant 320 can be grease or lubricating fluid. It is understood that grease has weaker fluidity than lubricating fluid, and therefore, grease is less prone to leakage than lubricating fluid. Thus, grease can provide more durable lubrication for the sliding contact parts between the inner shaft 200 and the outer shaft 100.

[0033] The outer shaft 100 is provided with a lubricant channel 130. The inlet 131 of the lubricant channel 130 communicates with the first cavity 310, and the outlet 132 of the lubricant channel 130 faces the sliding contact area 330 between the inner shaft 200 and the outer shaft 100. In this way, the lubricant 320 in the first cavity 310 can be transported to the sliding contact area 330 between the inner shaft 200 and the outer shaft 100 through the lubricant channel 130, so that the lubricant 320 can be used to lubricate the sliding contact parts between the inner shaft 200 and the outer shaft 100, thereby reducing the wear of the sliding contact parts between the inner shaft 200 and the outer shaft 100.

[0034] The cavity wall of the first cavity 310 is provided with a first one-way valve 410. The first one-way valve 410 is used to allow outside air to enter the first cavity 310 while preventing air from escaping from the first cavity 310. For example, the first one-way valve 410 is an intake one-way valve.

[0035] In this way, in the embodiments of the present invention, the outer shaft 100 and the inner shaft 200 can transmit torque and can slide relative to each other. The area between the first end 220 of the inner shaft 200 and the bottom 111 of the mating hole 110 forms a first cavity 310, and a lubricant 320 is provided in the first cavity 310.

[0036] During the shortening of the drive shaft 1 (i.e., the inner shaft 200 moves closer to the bottom of the mating hole 110), the volume of the first cavity 310 decreases, and the air pressure inside the first cavity 310 increases. The gas in the first cavity 310 can drive the lubricant 320 near the inlet 131 of the lubricant channel 130 to be transported through the lubricant channel 130 to the sliding mating area 330 between the inner shaft 200 and the outer shaft 100. Thus, the lubricant 320 is used to lubricate the sliding contact parts between the inner shaft 200 and the outer shaft 100, thereby reducing the wear of the sliding contact parts between the inner shaft 200 and the outer shaft 100.

[0037] During the extension of the drive shaft 1 (i.e., the inner shaft 200 moves away from the bottom of the mating hole 110), the volume of the first cavity 310 increases, and the air pressure inside the first cavity 310 decreases. External air is then replenished into the first cavity 310 via the first one-way valve 410. This prevents the lubricant 320 in the sliding fit area 330 between the inner shaft 200 and the outer shaft 100 from being "drawn back" into the first cavity 310 due to the decreased air pressure. Thus, during the extension of the drive shaft 1, the lubricant 320 in the sliding fit area 330 between the inner shaft 200 and the outer shaft 100 remains adhered to the sliding fit area 330, maintaining lubrication between the inner shaft 200 and the outer shaft 100 and reducing wear on the sliding contact area.

[0038] In some embodiments, the wall of the mating hole 110 is provided with a groove 120, and the outer periphery of the inner shaft 200 is provided with a protrusion 210. The protrusion 210 and the groove 120 are slidably connected along the axial direction of the inner shaft 200. In this way, by means of the sliding engagement between the protrusion 210 of the inner shaft 200 and the groove 120 of the wall of the mating hole 110, the inner shaft 200 and the outer shaft 100 can slide relative to each other during torque transmission.

[0039] refer to Figure 4 In some embodiments, the mating hole 110 is a spline hole, the keyway of the spline hole forms a groove 120, and the protrusion 210 is a key tooth. Exemplarily, the spline hole has multiple keyways, each keyway forming one groove 120. Figure 4 For example, the splined bore has eight keyways, which correspondingly form eight grooves 120 as described above. The outer shaft 100 is a splined shaft with eight key teeth. The eight key teeth form eight protrusions 210 as described above. The key teeth are slidably connected to the keyways in a one-to-one correspondence, so that the outer shaft 100 and the inner shaft 200 can transmit torque and slide relative to each other.

[0040] It should be noted that since splined holes and splined shafts are conventional structures in the mechanical field, the specific construction and transmission principle of the outer shaft 100 and inner shaft 200 when the mating hole 110 is a splined hole and the protrusion 210 is a key tooth will not be described in detail here. It should be noted that although... Figure 4 The illustration only shows the case where the spline hole has 8 keyways and the spline shaft has 8 key teeth. It is understood that those skilled in the art can flexibly set the number of keyways and key teeth and flexibly adjust the distribution pattern of keyways and key teeth according to their needs when implementing the solution provided by this utility model. This will not be elaborated here.

[0041] It should also be noted that in other embodiments, the mating hole 110 can be configured to resemble a spline hole, and the protrusion 210 can be configured to resemble key teeth. For example, see reference... Figure 4 In other embodiments, the mating hole 110 may only include two grooves 120, and correspondingly, the outer shaft 100 may only include two protrusions 210, so that the outer shaft 100 and the inner shaft 200 can transmit torque and slide relative to each other.

[0042] In other embodiments, the outer periphery of the inner shaft 200 is provided with a guide key, which forms a protrusion 210. In this way, the inner shaft 200 and the outer shaft 100 can slide relative to each other during torque transmission by means of the guide key slidingly engaging with the groove 120 of the hole wall of the mating hole 110.

[0043] refer to Figure 3 and Figure 6 In some embodiments, the wall of the mating hole 110 is provided with a lubricant collection groove 140. The lubricant collection groove 140 is annular around the axis of the outer shaft 100, and the inlet 131 of the lubricant flow channel 130 is in communication with the lubricant collection groove 140.

[0044] In this way, as the drive shaft 1 shortens, the volume of the first cavity 310 decreases, the air pressure inside the first cavity 310 increases, and the gas in the first cavity 310 can drive the lubricant 320 in the lubricant collection tank 140 to be transported through the lubricant flow channel 130 to the sliding contact area 330 between the inner shaft 200 and the outer shaft 100. Thus, the lubricant 320 is used to lubricate the sliding contact area between the inner shaft 200 and the outer shaft 100, thereby reducing the wear of the sliding contact area between the inner shaft 200 and the outer shaft 100.

[0045] It should be noted that, during the actual operation of the drive shaft 1, the outer shaft 100 rotates around its own axis. Therefore, under the centrifugal force generated by the rotation of the outer shaft 100, lubricant 320 adheres to the wall of the mating hole 110 located in the area of ​​the first cavity 310. Since the lubricant collection groove 140 is recessed relative to the wall of the mating hole 110, a significant amount of lubricant 320 is collected in the lubricant collection groove 140. Furthermore, during the shortening process of the drive shaft 1, the lubricant 320 in the lubricant collection groove 140 is compressed by the gas in the first cavity 310 into the lubricant flow channel 130, thereby being transported to the sliding mating area 330 between the inner shaft 200 and the outer shaft 100.

[0046] refer to Figure 3 In some embodiments, the end of the wall of the mating hole 110 facing the bottom 111 of the mating hole 110 is the bottom end 150 of the hole wall. The inlet 131 of the lubricant flow channel 130 is located at the bottom end 150 of the hole wall.

[0047] Thus, combined Figure 6 and Figure 7 During the reciprocating motion of the inner shaft 200 and its extension / retraction relative to the outer shaft 100, the first end 220 of the inner shaft 200 can push the lubricant 320 on the wall of the mating hole 110 toward the bottom end 150 of the hole wall. This allows the lubricant 320 to be better collected in the lubricant collection tank 140. Thus, during the shortening of the drive shaft 1, the lubricant 320 in the lubricant collection tank 140 can be compressed by the gas in the first cavity 310 into the lubricant flow channel 130, and then transported to the sliding mating area 330 between the inner shaft 200 and the outer shaft 100.

[0048] refer to Figure 3 , Figures 5 to 7 In some embodiments, the wall of the mating hole 110 is further provided with a lubricant storage groove 160. The outlet 132 of the lubricant flow channel 130 is opened at the bottom of the lubricant storage groove 160, and the opening of the lubricant storage groove 160 faces the outer peripheral surface of the inner shaft 200. In this way, the lubricant storage groove 160 can store lubricant 320. During the sliding process of the inner shaft 200 relative to the outer shaft 100, the outer peripheral surface of the inner shaft 200 can adhere to the lubricant 320 from the lubricant storage groove 160, which can ensure that the sliding mating area 330 between the inner shaft 200 and the outer shaft 100 has a good lubrication effect.

[0049] refer to Figure 3 , Figures 5 to 7 In some embodiments, the lubricant reservoir 160 is annular around the axis of the outer shaft 100. In this way, during the extension and retraction sliding of the inner shaft 200 relative to the outer shaft 100, the lubricant 320 can be fully adhered to the inner shaft 200 in the circumferential direction, so that the sliding contact area 330 between the inner shaft 200 and the outer shaft 100 can be fully lubricated in the circumferential direction.

[0050] refer to Figure 3 , Figures 5 to 7 In some embodiments, there are multiple lubricant storage tanks 160, which are spaced apart along the axial direction of the outer shaft 100. By providing multiple rings of lubricant storage tanks 160, the amount of lubricant 320 stored in the sliding contact area 330 between the inner shaft 200 and the outer shaft 100 can be increased, thereby further improving the lubrication effect of the sliding contact area 330 between the inner shaft 200 and the outer shaft 100.

[0051] In some embodiments, the number of outlets 132 of the lubricant channels 130 is equal to the number of lubricant storage tanks 160. Each outlet 132 of the lubricant channel 130 is connected to a lubricant storage tank 160 in a one-to-one correspondence. Figure 3For example, the wall of the mating hole 110 is provided with three rings of lubricant storage tanks 160. The number of outlets 132 of the lubricant flow channel 130 is three, and the outlets 132 of the lubricant flow channel 130 are connected to the lubricant storage tanks 160 one by one.

[0052] Of course, those skilled in the art can flexibly adjust the number of lubricant storage tanks 160 and the number of lubricant flow channels 130 according to actual needs when implementing the solution provided by the embodiments of this utility model, which will not be elaborated here.

[0053] refer to Figure 3 , Figures 5 to 7 In some embodiments, multiple lubricant channels 130 are provided, and the multiple lubricant channels 130 are circumferentially distributed around the axis of the outer shaft 100. Figure 5 For example, there are four lubricant channels 130, which are circumferentially distributed around the axis of the outer shaft 100. Of course, those skilled in the art can flexibly adjust the number of lubricant channels 130 according to actual needs when implementing the solution provided in this embodiment of the present invention, which will not be elaborated here.

[0054] In some embodiments, when there are multiple lubricant channels 130 and multiple lubricant storage tanks 160, each lubricant channel 130 is connected to each lubricant storage tank 160. For example, there are three lubricant channels 130, namely a first lubricant channel, a second lubricant channel, and a third lubricant channel. The first lubricant channel is connected to each lubricant storage tank 160, the second lubricant channel is connected to each lubricant storage tank 160, and the third lubricant channel is connected to each lubricant storage tank 160.

[0055] Alternatively, in other embodiments, the number of lubricant channels 130 is equal to the number of lubricant storage tanks 160, and each lubricant channel 130 is connected to a lubricant storage tank 160 in a one-to-one correspondence. For example, there are three lubricant channels 130, namely a first lubricant channel, a second lubricant channel, and a third lubricant channel. There are also three lubricant storage tanks 160, namely a first lubricant storage tank, a second lubricant storage tank, and a third lubricant storage tank. The first lubricant channel is connected to the first lubricant storage tank, the second lubricant channel is connected to the second lubricant storage tank, and the third lubricant channel is connected to the third lubricant storage tank.

[0056] It should be noted that those skilled in the art can flexibly adjust the connection scheme between the lubricant flow channel 130 and the lubricant storage tank 160 according to their needs when implementing the solution provided in this utility model embodiment, which will not be elaborated here.

[0057] refer to Figure 3 , Figure 6 and Figure 7 In some embodiments, the outer shaft 100 has a first through hole. One end of the first through hole opposite to the inner shaft 200 is blocked by an end cap 170. The end cap 170 has a second through hole. A first one-way valve 410 is located in the second through hole. Exemplarily, the axis of the second through hole coincides with the axis of the outer shaft 100. Exemplarily, the outer periphery of the end cap 170 is circular, and the second through hole is located at the center of the end cap 170. This prevents lubricant from easily adhering to the first one-way valve 410.

[0058] refer to Figure 8 In some embodiments, the first one-way valve 410 includes a first valve body 411, a first valve core 413, and a first elastic element 414. Exemplarily, the first valve core 413 is a steel ball, and the first elastic element 414 is a cylindrical spring. The first valve body 411 is provided with an air inlet 412, and the first valve core 413 elastically abuts against the outlet of the air inlet 412 via the first elastic element 414. Thus, to... Figure 8 Taking the shown orientation as an example, when the air pressure on the right side of the first valve core 413 is less than the air pressure on the left side of the first valve core 413, the pressure difference can overcome the elastic force of the first elastic element 414, thereby causing the gas on the left side of the first valve core 413 to push open the first valve core 413, and then the gas can be replenished to the left side of the first valve core 413 through the air inlet 412 which is in the open state.

[0059] Furthermore, combined with Figure 7 During the extension of the drive shaft 1, the volume of the first cavity 310 increases, the air pressure inside the first cavity 310 decreases, and the external air pressure is greater than the air pressure inside the first cavity 310. The external gas overcomes the elastic force of the first elastic element 414, thereby pushing open the first valve core 413. Then, ambient air can be replenished into the first cavity 310 through the first one-way valve 410. This prevents the lubricant 320 in the sliding fit area 330 between the inner shaft 200 and the outer shaft 100 from being "drawn back" into the first cavity 310 due to the decreased air pressure inside the first cavity 310. Therefore, during the extension of the drive shaft 1, the lubricant 320 in the sliding fit area 330 between the inner shaft 200 and the outer shaft 100 remains adhered to the sliding fit area 330, maintaining lubrication between the inner shaft 200 and the outer shaft 100 and reducing wear on the sliding contact area.

[0060] refer to Figure 1 , Figure 2 and Figure 9 In some embodiments, the drive shaft 1 further includes a telescopic sleeve 500. Exemplarily, the telescopic sleeve 500 is a bellows. Of course, the telescopic sleeve 500 can also be other devices, which will not be listed here. The telescopic sleeve 500 includes a second end 510 and a third end 520. The second end 510 is sleeved outside the outer shaft 100, and the third end 520 is sleeved outside the inner shaft 200. The area between the telescopic sleeve 500 and the inner shaft 200 forms a second cavity 600. The first cavity 310 and the second cavity 600 are connected via a fitting gap between the inner shaft 200 and the outer shaft 100. The cavity wall of the second cavity 600 is provided with a second one-way valve 420, which allows air to be discharged from the second cavity 600 while preventing outside air from entering the second cavity 600.

[0061] Thus, during the shortening of the drive shaft 1, the volume of the first cavity 310 decreases, and the air pressure within the first cavity 310 increases. The gas in the first cavity 310 can drive the lubricant 320 near the inlet 131 of the lubricant channel 130, delivering it through the lubricant channel 130 to the sliding contact area 330 between the inner shaft 200 and the outer shaft 100. This lubricant 320 lubricates the sliding contact area between the inner shaft 200 and the outer shaft 100, reducing wear on this area. A small amount of gas in the first cavity 310 escapes into the second cavity 600 through the gap between the inner shaft 200 and the outer shaft 100. The gas escaping into the second cavity 600 increases the air pressure there, causing it to be discharged through the second one-way valve 420.

[0062] Furthermore, the sliding contact between the outer shaft 100 and the inner shaft 200 generates heat during relative telescopic sliding. This heat increases the air pressure in the second cavity 600, allowing the gas in the second cavity 600 to be discharged through the second one-way valve 420. Thus, by incorporating the second one-way valve 420, gas can be released from the second cavity 600, extending the service life of the telescopic sleeve 500.

[0063] refer to Figure 9 The inner shaft 200 is provided with an air outlet 230 and a mounting hole 240. The mounting hole 240 communicates with the second cavity 600 through the air outlet 230. The second one-way valve 420 is provided in the mounting hole 240.

[0064] refer to Figure 10In some embodiments, the second one-way valve 420 includes a second valve body 421, a second valve core 423, and a second elastic element 424. Exemplarily, the second valve core 423 is a steel ball, and the second elastic element 424 is a cylindrical spring. The second valve body 421 has a vent hole 422, and the second valve core 423 elastically abuts against the outlet of the vent hole 422 via the second elastic element 424. Thus, to... Figure 10 Taking the shown orientation as an example, when the air pressure on the lower side of the second valve core 423 is greater than the air pressure on the upper side of the second valve core 423, the pressure difference can overcome the elastic force of the second elastic element 424, thereby pushing open the second valve core 423, and then the gas can be discharged to the upper side of the second valve core 423 through the exhaust port 422 which is in the open state.

[0065] Furthermore, combined with Figure 6 and Figure 9 During the shortening of the drive shaft 1, the volume of the first cavity 310 decreases, and the air pressure inside the first cavity 310 increases. The gas in the first cavity 310 can drive the lubricant 320 near the inlet 131 of the lubricant channel 130, and deliver it through the lubricant channel 130 to the sliding contact area 330 between the inner shaft 200 and the outer shaft 100. This lubricant 320 lubricates the sliding contact area between the inner shaft 200 and the outer shaft 100, thereby reducing wear on the sliding contact area. A small amount of gas in the first cavity 310 escapes into the second cavity 600 through the gap between the inner shaft 200 and the outer shaft 100. The gas escaping into the second cavity 600 increases the air pressure in the second cavity 600, thereby pushing open the second valve core 423. The gas in the second cavity 600 can then be discharged into the external environment through the open exhaust port 422.

[0066] refer to Figure 1 In some embodiments, the driveshaft 1 further includes a universal joint 700. Exemplarily, a first connecting portion of the universal joint 700 is connected to the power output end, and a second connecting portion of the universal joint 700 is connected to the end of the outer shaft 100 opposite to the inner shaft 200. When the driveshaft 1 is configured in a vehicle, for example, the vehicle also includes an engine, a transfer case, a reduction gear, a drive shaft, and wheels. The engine's output shaft is connected to the transfer case, and the transfer case's output shaft is connected to the power output end. The reduction gear is connected to the end of the inner shaft 200 opposite to the outer shaft 100. The power output from the engine's output shaft is transmitted to the wheels via the transfer case, driveshaft 1, reduction gear, and drive shaft, thereby driving the vehicle.

[0067] This utility model embodiment provides a vehicle. The vehicle provided by this utility model embodiment includes any of the driveshaft 1 provided by this utility model embodiment. Exemplarily, the vehicle can be an off-road vehicle (ORV). The vehicle can be a sport utility vehicle (SUV). The vehicle can be a sedan. The vehicle can be a new energy vehicle. These will not be listed further here.

[0068] 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.

[0069] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A drive shaft, characterized in that, include: Outer shaft (100) and inner shaft (200); The outer shaft (100) is provided with a mating hole (110), and the inner shaft (200) is sleeved in the mating hole (110). The outer shaft (100) and the inner shaft (200) can transmit torque and can slide relative to each other. The inner shaft (200) includes a first end (220) opposite to the bottom (111) of the mating hole (110). The area between the first end (220) and the bottom (111) of the mating hole (110) forms a first cavity (310). Lubricant (320) is provided in the first cavity (310). The outer shaft (100) is provided with a lubricant channel (130). The inlet (131) of the lubricant channel (130) communicates with the first cavity (310). The outlet (132) of the lubricant channel (130) faces the sliding mating area (330) between the inner shaft (200) and the outer shaft (100). The cavity wall of the first cavity (310) is provided with a first one-way valve (410). The first one-way valve (410) is used to allow outside air to enter the first cavity (310) while blocking the air in the first cavity (310) from being discharged.

2. The drive shaft according to claim 1, characterized in that, The wall of the mating hole (110) is provided with a groove (120), and the outer periphery of the inner shaft (200) is provided with a protrusion (210). The protrusion (210) and the groove (120) are slidably connected along the axial direction of the inner shaft (200).

3. The drive shaft according to claim 1, characterized in that, The wall of the mating hole (110) is provided with a lubricant collection groove (140), which is annular around the axis of the outer shaft (100), and the inlet (131) of the lubricant flow channel (130) is connected to the lubricant collection groove (140).

4. The drive shaft according to claim 3, characterized in that, The end of the hole wall of the mating hole (110) facing the bottom (111) of the hole (110) is the bottom end (150) of the hole wall, and the inlet (131) of the lubricant flow channel (130) is located at the bottom end (150) of the hole wall.

5. The drive shaft according to claim 1, characterized in that, The wall of the mating hole (110) is also provided with a lubricant storage tank (160), and the outlet (132) of the lubricant flow channel (130) is opened at the bottom of the lubricant storage tank (160). The opening of the lubricant storage tank (160) faces the outer peripheral surface of the inner shaft (200).

6. The drive shaft according to claim 5, characterized in that, The lubricant storage tank (160) is annular, surrounding the axis of the outer shaft (100).

7. The drive shaft according to claim 5, characterized in that, The number of the lubricant storage tanks (160) is multiple, and the multiple lubricant storage tanks (160) are distributed at intervals along the axial direction of the outer shaft (100).

8. The drive shaft according to claim 1, characterized in that, The lubricant channels (130) are provided in multiple ways, and the multiple lubricant channels (130) are circumferentially distributed around the axis of the outer shaft (100).

9. The drive shaft according to claim 1, characterized in that, The drive shaft also includes a telescopic sleeve (500), which includes a second end (510) and a third end (520). The second end (510) is sleeved on the outer shaft (100), and the third end (520) is sleeved on the inner shaft (200). The area between the telescopic sleeve (500) and the inner shaft (200) forms a second cavity (600). The first cavity (310) and the second cavity (600) are connected through the fitting gap between the inner shaft (200) and the outer shaft (100). The cavity wall of the second cavity (600) is provided with a second one-way valve (420). The second one-way valve (420) is used to allow air in the second cavity (600) to be discharged, while blocking outside air from entering the second cavity (600).

10. A vehicle, characterized in that, include: The drive shaft according to any one of claims 1 to 9.

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