Telescopic intermediate transmission mechanism for truck

Abstract

The utility model discloses a telescopic intermediate transmission mechanism for a truck, which relates to the technical field of transmission shafts and particularly comprises a spline shaft and a spline sleeve matched with the spline shaft, the spline shaft is coaxially arranged in a protective sleeve, one end of the protective sleeve is hermetically fixed with the spline shaft, and a gap is reserved between the end of the protective sleeve and the spline shaft; the spline shaft is sleeved with the spline sleeve which is movably arranged in the gap, and a sealing assembly making close contact with the spline sleeve is arranged at the opening of the protective sleeve. Lubricating oil is arranged in the protective sleeve, and a flowing hole communicated with the interior of the spline sleeve is formed in the surface of the spline sleeve. During use, the protective sleeve is filled with oil drainage lubricating oil, the spline shaft can drive the lubricating oil in the oil storage cavity to flow when stretching out and drawing back in the spline sleeve, the lubricating oil can flow in the spline sleeve, the spline shaft and the protective sleeve, the spline sleeve and the spline shaft can be better lubricated, the lubricating oil is sealed in the protective sleeve, and the service life of the spline shaft is prolonged. Lubricating oil is prevented from contacting with air to oxidize.

Description

Technical Field

[0001] The utility model relates to the technical field of drive shafts, in particular to a telescopic intermediate drive mechanism for a truck. Background Technique

[0002] A drive shaft is a shaft that transmits power. It is a transmission medium that transmits the power output by the engine to the vehicle drive wheels after the speed reduction and torsion of the gearbox. The drive shaft is an important component in the vehicle transmission system for transmitting power.

[0003] Most drive shafts are equipped with telescopic joints. The structure of the telescopic joint is realized by the cooperation of a spline shaft and a spline sleeve. The main purpose of setting the telescopic joint on the drive shaft is to make the total length of the drive shaft telescopic to ensure that there is no movement interference under the condition that the relative positions of the drive axle and the transmission often change, which plays a key role in the stability of the shaft.

[0004] However, the existing cooperation between the spline shaft and the spline sleeve requires lubricating oil to be injected. The lubricating oil will be oxidized when exposed to the outside for a long time, shortening its service life, thereby accelerating the wear between the spline shaft and the spline sleeve. Content of the Utility Model

[0005] In view of the deficiency of poor lubrication between the spline sleeve and the spline shaft in the existing drive shaft, the utility model provides a telescopic intermediate drive mechanism for a truck, which has the advantage of forming and discharging lubricating oil in the protective sleeve and can better lubricate between the spline sleeve and the spline shaft, and solves the problems raised in the above background technique.

[0006] To achieve the above object, the utility model is realized through the following technical solutions: A telescopic intermediate drive shaft mechanism for a truck includes a spline shaft and a spline sleeve matching with the spline shaft. The spline shaft is coaxially arranged in a protective sleeve. One end of the protective sleeve is sealed and fixed with the spline shaft, and there is a gap between them; the spline sleeve is sleeved on the spline shaft and is movably placed in the gap. A sealing component in close contact with the spline sleeve is provided at the opening of the protective sleeve; lubricating oil is provided in the protective sleeve, and flow holes communicating with its interior are provided on the surface of the spline sleeve, so that the lubricating oil flows to the surface of the spline shaft through the flow holes.

[0007] Preferably, the sealing component includes a sealing sleeve arranged at the end of the protective sleeve. At least one dust-proof ring is provided on one side of the sealing sleeve close to its opening, and at least one sealing ring is provided on the remaining surface of the sealing sleeve. The sealing ring and the dust-proof ring are elastically in contact with the surface of the spline sleeve respectively.

[0008] Preferably, grooves matching with the sealing ring and the dust-proof ring are provided in the sealing sleeve, and the sealing ring and the dust-proof ring are placed in the grooves.

[0009] Preferably, an oil storage cavity is provided between one end of the spline sleeve away from its opening and the end of the spline shaft, and between one end of the spline sleeve close to its opening and one end of the protective sleeve away from the sealing assembly.

[0010] Preferably, two adding holes are symmetrically provided on the surface of one end of the protective sleeve close to the oil storage cavity, and a plug is threadedly connected in the adding hole.

[0011] Preferably, one end of the spline shaft away from the spline sleeve is connected to the transmission shaft through a first flange.

[0012] Preferably, one end of the spline sleeve away from the spline shaft is connected to the connecting shaft through a second flange, and the connecting shaft is connected to the input shaft of the rear axle through a third flange.

[0013] Compared with the prior art, when the utility model is in use, lubricating oil is stored in the protective sleeve, and when the spline shaft expands and contracts in the spline sleeve, it can drive the lubricating oil in the oil storage cavity to flow. The lubricating oil will flow in the spline sleeve, spline shaft and protective sleeve, which can better lubricate between the spline sleeve and the spline shaft, and the lubricating oil is sealed in the protective sleeve to prevent the lubricating oil from contacting with air and oxidizing. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 Structural schematic diagram of the utility model connected to the transmission shaft Figure 1 。

[0015] Figure 2 Structural schematic diagram of the utility model connected to the transmission shaft Figure 2 。

[0016] Figure 3 Structural schematic diagram of the connection between the spline sleeve and the spline shaft of the utility model Figure 1 。

[0017] Figure 4 Structural schematic diagram of the connection between the spline sleeve and the spline shaft of the utility model Figure 2 。

[0018] In the figure: 1. Transmission shaft; 2. First flange; 3. Protective sleeve; 4. Sealing sleeve; 5. Second flange; 6. Connecting shaft; 7. Third flange; 8. Spline sleeve; 9. Flow hole; 10. Dust-proof ring; 11. Sealing ring; 12. Plug; 13. Adding hole; 14. Oil storage cavity; 15. Spline shaft. DETAILED DESCRIPTION OF THE INVENTION

[0019] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0020] Please refer to Figures 1 to 4 , the present utility model provides a technical solution: a telescopic intermediate drive shaft transmission mechanism for a truck, including a spline shaft 15 and a spline sleeve 8 matching the spline shaft 15. When in use, the spline shaft 15 is inserted into the spline sleeve 8, and the spline shaft and the spline sleeve are combined to form a telescopic shaft, and the telescopic shaft is a common telescopic mechanism in the working position of the drive shaft. The purpose is to make the total length of the drive shaft telescopic to ensure that there is no movement interference under the condition that the relative positions of the drive axle and the transmission often change, and to ensure the continuity of power transmission.

[0021] As Figure 1 and Figure 2 shown, one end of the spline shaft 15 away from the spline sleeve 8 is connected to the drive shaft 1 through a first flange 2, one end of the spline sleeve 8 away from the spline shaft 15 is connected to the connecting shaft 6 through a second flange 5, and the connecting shaft 6 is connected to the input shaft of the rear axle through a third flange 7, so that the torque generated by the gearbox is transmitted to the rear axle through the drive shaft 1 and the telescopic shaft, thereby driving the vehicle to travel.

[0022] Since the spline shaft and the spline sleeve not only bear large torque during use, but also keep telescoping, preventing the spline shaft and the spline sleeve from wearing is of utmost importance. As Figure 1 and Figure 2 shown, the spline shaft 15 is coaxially arranged in the protective sleeve 3, one end of the protective sleeve 3 is fixedly sealed with the spline shaft 15 and there is a gap between the two. As Figure 3 shown, the spline sleeve 8 is sleeved on the spline shaft 15 and is movably placed in the gap. Specifically, there is a clearance fit between the spline sleeve 8 and the protective sleeve 3 to keep a certain gap between the two;

[0023] There is lubricating oil in the protective sleeve 3, and a sealing component in close contact with the spline sleeve 8 is provided at the opening of the protective sleeve 3. The sealing component seals the opening of the protective sleeve 3, thereby avoiding lubricating oil leakage. And there are flow holes 9 communicated with the inside on the surface of the spline sleeve 8, so that the lubricating oil flows to the surface of the spline shaft 15 through the flow holes 9, that is, the spline sleeve 8 and the protective sleeve 3 are communicated through the provided flow holes 9. It should be noted that the number of the flow holes 9 is multiple and they are fine holes, which can ensure the circulation of the lubricating oil and will not affect the strength of the spline sleeve 8;

[0024] An oil storage cavity 14 is provided between one end of the spline sleeve 8 away from its opening and the end of the spline shaft 15, and between one end of the spline sleeve 8 close to its opening and one end of the protective sleeve 3 away from the sealing assembly. The provided oil storage cavity 14 can not only store more lubricating oil, but also enable the spline shaft 15 to have sufficient telescopic margin when telescoping, preventing the spline shaft 15 from colliding with the spline sleeve and avoiding the spline sleeve 8 from colliding with the protective sleeve 3;

[0025] Therefore, when the spline sleeve 8 telescopes, the spline shaft 15 can drive the lubricating oil in the oil storage cavity 14 to flow. The lubricating oil will flow in the spline sleeve 8, the spline shaft 15 and the protective sleeve 3, which can better lubricate between the spline sleeve 8 and the spline shaft 15. Moreover, the lubricating oil is sealed in the protective sleeve 3 to prevent the lubricating oil from contacting the air and oxidizing.

[0026] Furthermore, the present application also gives the specific components of the sealing assembly. The sealing assembly includes a sealing sleeve 4 provided at the end of the protective sleeve 3. At least one dust-proof ring 10 is provided on one side of the sealing sleeve 4 close to its opening, and at least one sealing ring 11 is provided on the remaining surface of the sealing sleeve 4. The sealing ring 11 and the dust-proof ring 10 are in elastic contact with the surface of the spline sleeve 8 respectively. Specifically, grooves matching the sealing ring 11 and the dust-proof ring 10 are provided in the sealing sleeve 4, and the sealing ring 11 and the dust-proof ring 10 are placed in the grooves, so that each sealing ring can be fixed better.

[0027] Furthermore, two adding holes 13 are symmetrically provided on the surface of one end of the protective sleeve 3 close to the oil storage cavity 14. A plug 12 is threadedly connected in the adding hole 13. During assembly, after the spline sleeve is sleeved on the spline shaft, the lubricating oil can be manually injected through the adding hole 13.

[0028] Based on the above embodiments, it can be further optimized. In order to prevent dust from falling on the spline sleeve 8, as Figure 4 shown, a rubber telescopic sleeve can be installed between the first flange 2 and the second flange 5, which can prevent dust from adhering to the surface of the spline sleeve 8.

[0029] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model; the terms "first", "second", "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance. In addition, unless otherwise clearly specified and defined, the terms "installed", "connected", "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances. Moreover, the terms "comprising", "including" or any other variation thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or further includes elements inherent to such process, method, article or device.

[0030] Although the embodiments of the present utility model have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present utility model. The scope of the present utility model is defined by the appended claims and their equivalents.

Claims

1. A telescopic intermediate transmission mechanism for a truck, comprising a spline shaft (15) and a spline sleeve (8) matching with the spline shaft (15), characterized in that, The spline shaft (15) is coaxially arranged inside the protective sleeve (3). One end of the protective sleeve (3) is hermetically fixed to the spline shaft (15), and there is a gap between them. The spline sleeve (8) is sleeved on the spline shaft (15) and is movably placed in the gap. A sealing assembly in close contact with the spline sleeve (8) is provided at the opening of the protective sleeve (3). Lubricating oil is provided inside the protective sleeve (3), and flow holes (9) communicating with its interior are provided on the surface of the spline sleeve (8), so that the lubricating oil flows to the surface of the spline shaft (15) through the flow holes (9).

2. The retractable intermediate transmission mechanism for a truck according to claim 1, characterized in that, The sealing assembly includes a sealing sleeve (4) provided at the end of the protective sleeve (3). At least one dust-proof ring (10) is provided on one side close to the opening inside the sealing sleeve (4), and at least one sealing ring (11) is provided on the remaining surface inside the sealing sleeve (4). The sealing ring (11) and the dust-proof ring (10) are elastically in contact with the surface of the spline sleeve (8) respectively.

3. The telescopic intermediate drive mechanism for a truck according to claim 2, characterized in that, Grooves matching the sealing ring (11) and the dust-proof ring (10) are provided inside the sealing sleeve (4), and the sealing ring (11) and the dust-proof ring (10) are placed in the grooves.

4. The retractable intermediate transmission mechanism for a truck according to claim 1, characterized in that, An oil storage cavity (14) is provided both between the end of the spline sleeve (8) far from its opening and the end of the spline shaft (15), and between the end of the spline sleeve (8) close to its opening and the end of the protective sleeve (3) far from the sealing assembly.

5. The telescopic intermediate drive mechanism for a truck according to claim 4, characterized in that, Two adding holes (13) are symmetrically provided on the surface of one end of the protective sleeve (3) close to the oil storage cavity (14), and a plug (12) is threadedly connected inside the adding hole (13).

6. The telescopic intermediate drive mechanism for a truck according to claim 1, characterized in that, One end of the spline shaft (15) far from the spline sleeve (8) is connected to the transmission shaft (1) through the first flange (2).

7. The retractable intermediate drive mechanism for a truck according to any one of claims 1-6, characterized in that, One end of the spline sleeve (8) far from the spline shaft (15) is connected to the connecting shaft (6) through the second flange (5), and the connecting shaft (6) is connected to the input shaft of the rear axle through the third flange (7).

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