Integrated transmission shaft structure

Abstract

The utility model provides an integrated transmission shaft structure which comprises a spline shaft and a spline sleeve, a groove connected with an end face is formed in one axial side of the spline shaft, a bearing and the spline sleeve are sequentially arranged in the groove in a sleeved mode in the axial direction and locked through a fastener, and the side, away from the bearing, of the spline sleeve is connected with a shaft tube in a sealed mode. The buffering ring and the supporting shell are sequentially arranged on the outer side of the bearing in a sleeving mode in the radial direction. According to the integrated transmission shaft structure, annular sealing structures are defined by the framework oil seals on the two sides of the bearing respectively, slurry, water and the like are effectively prevented from entering the bearing shell to damage the bearing, and the framework oil seals located on the two sides of the bearing prevent lubricating grease from overflowing and meanwhile can prevent foreign matter from entering the bearing; the buffering ring is additionally arranged between the bearing and the supporting shell, the buffering ring relieves axial impact force while providing vibration prevention, the service life of the bearing is prolonged, and the failure rate and the maintenance cost of the integrated transmission shaft are greatly reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to transmission system technical field especially relates to a kind of integrated transmission shaft structure applicable to wheeled loader transmission system. BACKGROUND

[0002] In prior art, loader drive system is generally composed of front drive axle, integral front transmission, middle transmission shaft, gearbox, rear transmission shaft, rear drive axle, etc., to realize the torque transmission process of gearbox and front, rear drive axle, which has the defect that supporting bearing bears axial impact force, leading to bearing failure, which is the source of high failure rate of integral front transmission.

[0003] Therefore, whether integral front transmission of transmission system can effectively reduce axial impact force on its service life is crucial, so higher quality requirements are put forward for its sealing, vibration reduction and axial impact force offset, at present, integral front transmission bearing of transmission system mainly adopts single skeleton oil seal and hard support structure, which cannot avoid the failure caused by the above reasons. SUMMARY

[0004] To solve the above technical problems, the utility model provides a kind of integrated transmission shaft structure.

[0005] According to one purpose of the utility model, the utility model provides a kind of integrated transmission shaft structure, including: spline shaft and spline sleeve, the spline shaft is equipped with the recess of connecting end face on one side in axial direction, bearing and the spline sleeve are sequentially fitted in the recess in axial direction, and are locked by fastener, the side of the spline sleeve deviating from the bearing is sealedly connected with shaft pipe;

[0006] Buffer ring and supporting shell, the buffer ring and the supporting shell are sequentially fitted on the outside of the bearing in radial direction, and gap is formed between the supporting shell and the spline shaft and between the supporting shell and the spline sleeve in radial direction, the gap is located on both sides of the bearing in axial direction, and each gap is provided with skeleton oil seal.

[0007] Preferably, the buffer ring and the bearing are provided with restraint member between, the restraint member is set to constrain the buffer ring and the bearing in axial direction.

[0008] Preferably, the restraint member includes iron sulfide ring and snap spring, the iron sulfide ring is located on the radial inner side of the buffer ring and is set along the circumferential direction of the buffer ring, the radial inner side of the iron sulfide ring is grooved and cooperates with the snap spring to fix the position of the bearing.

[0009] Preferably, the integrated transmission shaft structure further includes:

[0010] A dust cover is arranged on the side of the gap away from the skeleton oil seal, and the dust cover axially covers the gap.

[0011] Preferably, the dust cover is an annular dust cover, the side of the dust cover away from the gap is an outer side of the dust cover, and the outer side of the dust cover is inclined towards the gap in a radial outer side.

[0012] Preferably, the dust cover comprises a first cover body and a second cover body, a positioning groove is arranged on the axially one end of the radial outer side of the spline sleeve, the first cover body is clamped in the positioning groove, and the side of the spline shaft away from the spline sleeve extends radially outward to form a limiting portion, and the limiting portion abuts against the side of the second cover body away from the gap.

[0013] Preferably, an oil nozzle is arranged on the supporting shell, and the oil nozzle is in communication with the skeleton oil seal.

[0014] Preferably, the bearing is a maintenance-free bearing.

[0015] Preferably, the shaft tube is connected with the universal joint fork, the cross shaft assembly, the elastic stop ring and the flange fork in sequence.

[0016] Preferably, the spline shaft and the spline sleeve are welded and sealed.

[0017] Compared with the prior art, the utility model has the beneficial effects that:

[0018] The integral type transmission shaft structure, through the skeleton oil seal is surrounded in two sides of bearing respectively one annular sealing structure, effectively prevent the mud, water and so on into the inside of supporting shell damage bearing, is located in the bearing skeleton oil seal of both sides prevents the grease overflow and simultaneously can prevent the foreign matter from entering;

[0019] The integral type transmission shaft structure, through the buffer ring is additionally arranged between the bearing and the supporting shell, the buffer ring provides the anti-vibration and simultaneously relieves the axial impact force, improves the service life of the support, greatly reduces the failure rate and the maintenance cost of the integral type transmission shaft.

[0020] The utility model is further described below in combination with the drawings and examples. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 It is integral type transmission shaft structure's whole schematic view that the utility model discloses a kind of;

[0022] Figure 2 It is integral type transmission shaft structure's shaft tube, universal joint fork, cross shaft assembly, elastic stop ring and flange fork connection state schematic view that the utility model discloses a kind of;

[0023] Figure 3Figure 1 is a schematic view of the prior art loader transmission system intermediate support bearing structure. DETAILED DESCRIPTION

[0024] The following description is made for the purpose of fully and completely illustrating the present application so that those skilled in the art can realize the present application. The preferred embodiments in the following description are only examples, and other obvious variations can be thought of by those skilled in the art. The basic principles defined in the following description can be applied to other embodiments, variations, improvements, equivalents and other technical solutions without departing from the spirit and scope of the present application.

[0025] Referring to Figure 3 , the existing loader transmission system support bearing structure comprises a locking nut 6, a spline sleeve 7, a skeleton oil seal 8, a bearing 9, a bearing sleeve 10, a spline shaft 11 and a support shell 12. Since there is only one skeleton oil seal 8 on each side, and the skeleton oil seal 8 is not lubricated with grease, there is dry grinding, and the sealing performance is not ideal. After working for 900 hours, the lip of the skeleton oil seal 8 will gradually wear out. Water, sand and other foreign matters from the lip will cause early failure of the bearing. In addition, the bearing sleeve 10 and the support shell 12 are in hard interference fit, and the vibration and axial impact force is large. In addition, the mounting error of the vehicle frame causes early failure of the bearing.

[0026] Referring to Figures 1-2 , the present application provides a technical solution: an integrated transmission shaft structure, comprising:

[0027] The spline shaft 13 and the spline sleeve 7, the spline shaft 13 is provided with a connecting end surface groove on one side in the axial direction, the bearing 10 and the spline sleeve 7 are sequentially sleeved in the groove in the axial direction and locked by the fastener 6, and the side of the spline sleeve 7 away from the bearing 10 is sealingly connected with the shaft tube 5;

[0028] The buffer ring 11 and the support shell 14, the buffer ring 11 and the support shell 14 are sequentially sleeved on the outside of the bearing 10 in the radial direction, and gaps are formed between the support shell 14 and the spline shaft 13 and between the support shell 14 and the spline sleeve 7 in the radial direction. The gaps are located on both sides of the bearing 10 in the axial direction, and each of the gaps is provided with a skeleton oil seal 9.

[0029] Preferably, the fastener 6 is a locking nut, the end of the spline shaft 13 in the axial direction is screwed with the locking nut, the locking nut can move in the axial direction of the spline shaft 13, and the fastener 6 abuts against the side of the spline sleeve 7 away from the bearing 10;

[0030] The spline shaft 13 and the spline sleeve 7 are welded and sealed, which can improve the connection strength of the spline shaft 13 and the shaft tube 5;

[0031] The buffer ring 11 is a rubber ring, and the buffer ring 11 and the supporting shell 14 are connected in a soft mode, which is used for resisting vibration and reducing impact force.

[0032] The supporting shell 14, the bearing 10, the spline shaft 13 and the skeleton oil seal 9, and the supporting shell 14, the bearing 10, the spline sleeve 7 and the skeleton oil seal 9 respectively form a ring-shaped sealing structure, which effectively prevents mud, water and the like from entering the inside of the supporting shell 14 and damaging the bearing 10, and the skeleton oil seal 9 located on both sides of the bearing 10 prevents the lubricating grease from overflowing and prevents foreign matters from entering at the same time.

[0033] By additionally arranging the buffer ring 11 between the bearing 10 and the supporting shell 14, the buffer ring 11 provides vibration resistance and relieves axial impact force, thereby improving the service life of the support and greatly reducing the failure rate and maintenance cost of the integrated drive shaft.

[0034] Further, a constraint member is arranged between the buffer ring 11 and the bearing 10, and the constraint member is arranged to constrain the buffer ring 11 and the bearing 10 in the axial direction. In an embodiment of the utility model, the constraint member comprises a vulcanized iron ring and a circlip, the vulcanized iron ring is located on the radial inner side of the buffer ring 11 and is arranged along the circumferential direction of the buffer ring 11, and the radial inner side of the vulcanized iron ring is slotted and cooperates with the circlip to fix the position of the bearing 10.

[0035] Further, the bearing 10 is a maintenance-free bearing 10, which avoids the influence of excessive or insufficient lubricating grease on the bearing 10.

[0036] In order to better protect the skeleton oil seal 9, further, the structure further comprises:

[0037] The dust cover 8 is located on the side of the gap away from the skeleton oil seal 9, and the dust cover 8 blocks the gap in the axial direction.

[0038] Further, the dust cover 8 is a ring-shaped dust cover 8, the side of the dust cover 8 away from the gap is the outer side of the dust cover 8, and the outer side of the dust cover 8 is inclined in a manner that the radial outer side is close to the gap.

[0039] Further, the dust cover 8 comprises a first cover body and a second cover body, a positioning groove is formed in the axial end of the radial outer side of the spline sleeve 7, the first cover body is clamped in the positioning groove, the spline shaft 13 extends outward in the radial direction away from the spline sleeve 7 to form a limiting portion, and the limiting portion abuts against the side of the second cover body away from the gap.

[0040] Further, the supporting shell 14 is provided with an oil nozzle 12, which is communicated with the cage oil seal 9.

[0041] In an embodiment of the present application, referring to Figure 2 The shaft tube 5 is connected with the flange fork 1 through the universal joint fork 4, the cross shaft assembly 3 and the elastic stop ring 2 in sequence, and the power transmission to the flange fork 1 can be realized through the cooperation of the key shaft 13, the universal joint fork 4 and the cross shaft assembly 3, so that stable transmission can be realized.

[0042] In summary, the buffering ring 11 is arranged between the bearing 10 and the supporting shell 14, the buffering ring 11 can prevent vibration and relieve axial impact force, so as to prolong the service life of the bearing 10, reduce the failure rate and maintenance cost of the integrated transmission shaft.

[0043] The cage oil seal 9 on both sides of the bearing 10 can prevent grease from overflowing and prevent foreign matters from entering, the dust cover 8 further protects the cage oil seal 9, the spline sleeve 7 and the key shaft 13 are sealed by the cage oil seal 9 to prevent the entry of mud, the cage oil seal 9 can be separately filled with grease to avoid dry grinding, and the service life of the cage oil seal 9 is prolonged.

[0044] The above-described embodiments are only used for illustrating the technical ideas and characteristics of the present application, and the purpose is to enable the person skilled in the art to understand the content of the present application and implement it, and the present embodiment cannot be used to limit the patent application range of the present application, that is, any equivalent changes or modifications made according to the disclosed spirit of the present application still fall within the patent range of the present application.

Claims

1. An integrated drive shaft structure, characterized by comprising: It comprises: a spline shaft (13) and a spline sleeve (7), a recess is formed on one side of the spline shaft (13) in the axial direction, a bearing (10) and the spline sleeve (7) are sequentially sleeved in the recess in the axial direction and locked by a fastener (6), and the spline sleeve (7) is sealingly connected with a shaft tube (5) on the side away from the bearing (10); a buffer ring (11) and a supporting shell (14) are sequentially sleeved on the outside of the bearing (10) in the radial direction, gaps are formed between the supporting shell (14) and the spline shaft (13) and between the supporting shell (14) and the spline sleeve (7) in the radial direction, the gaps are located on both sides of the bearing (10) in the axial direction, and a skeleton oil seal (9) is arranged in each gap.

2. A one-piece drive shaft structure according to claim 1, wherein A constraint member is arranged between the buffer ring (11) and the bearing (10), and the constraint member is arranged to constrain the buffer ring (11) and the bearing (10) in the axial direction.

3. A one-piece drive shaft structure according to claim 2, wherein The constraint member comprises a sulfurized iron ring and a snap spring, the sulfurized iron ring is located on the radially inner side of the buffer ring (11) and is arranged in the circumferential direction of the buffer ring (11), the radially inner side of the sulfurized iron ring is slotted and cooperates with the snap spring to fix the position of the bearing (10).

4. The one-piece drive shaft structure according to claim 1, wherein It also comprises: a dust cover (8) located on the side of the gap away from the skeleton oil seal (9), and the dust cover (8) shields the gap in the axial direction.

5. A one-piece drive shaft structure according to claim 4, wherein The dust cover (8) is an annular dust cover (8), the side of the dust cover (8) away from the gap is the outer side of the dust cover (8), and the outer side of the dust cover (8) is inclined to the gap in the radial direction.

6. A one-piece drive shaft structure according to claim 4, wherein The dust cover (8) comprises a first cover body and a second cover body, a positioning groove is formed on the radially outer side of the spline sleeve (7) in the axial direction, the first cover body is clamped in the positioning groove, the spline shaft (13) extends outward in the radial direction on the side away from the spline sleeve (7) to form a limiting portion, and the limiting portion abuts against the side of the second cover body away from the gap.

7. The one-piece drive shaft structure according to claim 1, wherein An oil nozzle (12) is mounted on the supporting shell (14), and the oil nozzle (12) is in communication with the skeleton oil seal (9).

8. The one-piece drive shaft structure according to claim 1, wherein The bearing (10) is a maintenance-free bearing (10).

9. The one-piece drive shaft structure according to claim 1, wherein The shaft tube (5) is connected with the flange fork (1) through the universal joint fork (4), the cross shaft assembly (3) and the elastic retainer (2) in sequence.

10. The one-piece drive shaft structure according to claim 1, wherein The spline shaft (13) and the spline sleeve (7) are welded and sealed.

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