CN106812811A - Transmission shaft structure and power transmission shaft - Google Patents

Abstract

The present invention relates to vehicle drive shaft technical field, there is provided a kind of transmission shaft structure, the transmission shaft structure includes：Bearing, the outer ring of the bearing is provided with shock-absorbing supporting device, and the shock-absorbing supporting device can be fixedly supported on car body；Spline housing, the spline housing is assemblied in the inner ring of the bearing by spline structure；Splined shaft, the splined shaft is assemblied in the spline housing by keyway arrangements and being capable of axial stretching, with vibration noises such as the rotation imbalances that significantly reduces or solve the problems, such as power transmission shaft and cause because mass distribution is uneven, and with good energy-absorbing vibration isolating effect, lift the NVH performances of transmission system.

Description

Drive shaft structure and drive shaft

technical field

The invention relates to the technical field of vehicle transmission shafts, in particular to a transmission shaft structure and a transmission shaft with such a transmission shaft structure.

Background technique

As people's requirements for vehicle driving system and NVH performance are getting higher and higher, the performance design of various parts of the vehicle is also continuously improved. As is known, propshafts are essential components in vehicle powertrains. At present, with the increasing number of front-wheel drive and timely four-wheel drive or front-rear drive vehicles, the longitudinal transmission shaft has become one of the indispensable components in the process of torque transmission.

In an existing vertical transmission shaft structure, that is, in the design of a transmission shaft with a shaft tube length greater than 1.5 m, the transmission shaft is provided with an intermediate support structure. In this kind of transmission shaft structure, a telescopic spline structure is usually set separately in front of the middle support structure and behind the latter according to the structure of the vehicle model (front-rear drive or front-front drive four-wheel drive), or, this An intermediate supporting structure is set at the front and rear of the transmission shaft structure. For example, in the transmission shaft of the existing front-wheel-drive intelligent four-wheel drive vehicle, a telescopic spline shaft is designed between the intermediate support structure and the transfer case, and a shaft tube is rigidly connected between the intermediate support structure and the rear final drive. , the intermediate support structure can be fixed on the body floor or frame by bolts, etc.

However, since the telescopic spline structure is designed on one side of the intermediate support structure, this will lead to uneven mass of the transmission shaft, and the weight of the intermediate shaft tube will increase, increasing the centrifugal force and imbalance during rotation, and the resulting vibration cannot be effectively isolated , causing the drive shaft to cause abnormal vibrations during torque transmission. In addition, when the whole vehicle is running bumpy, the rear main reducer moves relative to the intermediate support structure. Since the telescopic spline structure is arranged on the other side of the intermediate support structure, the relative movement of the rear final reducer relative to the intermediate support structure The displacement can only be compensated by the deformation of the rubber sleeve of the intermediate support structure. On the one hand, it is easy to cause axial vibration and reduce the NVH performance of the transmission system. On the other hand, it reduces the durability of the rubber sleeve and even leads to early failure of the rubber sleeve.

For the front-rear-wheel-drive model, the telescopic spline structure is arranged between the intermediate support structure of the transmission shaft and the rear final drive, and its functional principle is similar to that of the front-front-drive model, so it will not be described in detail here.

In addition, in the existing structure, since each universal joint of the transmission shaft has an arrangement angle in the design of the vehicle, and the telescopic spline structure is designed at the front or rear section of the intermediate support structure, this will cause the axis of the telescopic spline structure to There is an included angle between the axes of the intermediate support structure, and radial unbalanced force will be generated during the torque transmission process of the transmission shaft, which will have a vibration effect on the intermediate support structure and easily cause vibration of the whole vehicle. This vibration is mainly through the intermediate support of the transmission shaft The structure is transferred to the body floor.

Contents of the invention

In view of this, the present invention aims to propose a transmission shaft structure to significantly reduce or solve vibration and noise problems such as unbalanced rotation of the transmission shaft due to uneven mass distribution, and has a good energy absorption and vibration isolation effect, and improves the transmission System NVH performance.

In order to achieve the above object, technical solution of the present invention is achieved in that way:

A transmission shaft structure, the transmission shaft structure includes: a bearing, the outer ring of the bearing is provided with a shock-absorbing support device, and the shock-absorbing support device can be fixedly supported on the vehicle body; a spline sleeve, the spline The sleeve is assembled in the inner ring of the bearing through a spline structure; the spline shaft is assembled in the spline sleeve through a keyway structure and can be axially expanded and contracted.

Compared with the prior art, the transmission shaft structure of the present invention has the following advantages:

Since a part forming the telescopic spline structure, that is, the spline sleeve, is assembled in the inner ring of the bearing through the spline structure, and the outer ring of the bearing is provided with a shock-absorbing support device, the shock-absorbing support device can be fixedly supported in the actual assembly. On the car body, at the same time, another part forming the telescopic spline structure, that is, the spline shaft, is assembled in the spline sleeve through the keyway structure and can be stretched axially. In this way, the telescopic spline structure of the present invention is arranged in the middle of the transmission shaft In the supporting structure, it is set on the bearing and the shock-absorbing support device, so that the vibration and noise problems such as the rotation imbalance caused by the uneven mass distribution of the transmission shaft can be significantly reduced or solved, and at the same time, the intermediate support structure can also be fully utilized. The vibration isolation capability of the shock-absorbing support device absorbs the expansion resistance or rotational unbalanced force of the telescopic spline structure, has a good energy absorption and vibration isolation effect, and significantly improves the NVH performance of the transmission system.

Further, the spline sleeve can expand and contract axially relative to the inner ring of the bearing through the spline structure.

Further or alternatively, the end of the spline sleeve away from the spline shaft is connected with a cross shaft through a universal joint flange fork; The knuckle flange fork is connected with another said cross shaft.

Further or alternatively, the shock-absorbing support device includes a sheet metal cover, the sheet metal cover is fitted on the outer ring of the bearing through its own recess, and the sides and sides of the sheet metal cover A spline dustproof oil seal is arranged between the outer peripheral surfaces of the spline sleeve.

Furthermore, the side edges on both sides of the sheet metal cover axially extend away from the bearing on both sides of the bearing, so that the spline dustproof oil seal can be arranged on the entire inner surface of the side edges, In addition, a space is maintained between the oil seal part of the spline dustproof oil seal that is in contact with the outer peripheral surface of the spline sleeve and the side surface of the bearing.

Further or alternatively, a spline dust-proof oil seal is provided between the shock-absorbing support device and the outer peripheral surface of the spline sleeve, and the spline dust-proof oil seal is fixedly connected to the shock-absorbing support device and is connected to the shock-absorbing support device. The outer peripheral surface of the spline sleeve is interference fit.

Further or alternatively, the shock-absorbing support device includes a dust-proof and shock-absorbing rubber sleeve, a shock-absorbing block, and a bracket, wherein the dust-proof and shock-absorbing rubber sleeve is assembled on the said bearing through its own groove. On the outer ring, the damping block is arranged in the inner cavity of the dustproof and shock absorbing rubber sleeve, and the bracket is arranged on the outer surface of the dustproof and shock absorbing rubber sleeve so as to be fixedly supported on the vehicle body superior.

Furthermore, the dust-proof and shock-absorbing rubber sleeve, the shock-absorbing block and the bracket are vulcanized to form an integrated structure.

Further or alternatively, a keyway dust-proof oil seal is provided between the socket of the spline sleeve and the outer peripheral surface of the spline shaft, and the keyway dust-proof oil seal is fixedly connected to the outer peripheral surface of the spline sleeve And interference fit with the outer peripheral surface of the spline shaft.

In addition, the present invention also provides a transmission shaft, the transmission shaft is provided with the above transmission shaft structure.

Since the propeller shaft of the present invention includes the above propeller shaft structure, as mentioned above, the NVH performance of the propeller shaft and the vehicle using the propeller shaft will be significantly improved.

Other features and advantages of the present invention will be described in detail in the detailed description that follows.

Description of drawings

The drawings constituting a part of the present invention are used to provide a further understanding of the present invention, and the schematic embodiments and descriptions of the present invention are used to explain the present invention, and do not constitute an improper limitation of the present invention. In the attached picture:

Fig. 1 is a schematic cross-sectional structure diagram of a transmission shaft structure provided by an embodiment of the present invention;

FIG. 2 is a partially enlarged schematic diagram of FIG. 1 .

Explanation of reference signs:

1-drive shaft structure, 2-bearing, 3-outer ring, 4-shock absorbing support device, 5-spline sleeve, 6-inner ring, 7-spline shaft, 8-universal joint flange fork, 9- Sheet metal cover, 10-spline dust-proof oil seal, 11-side, 12-oil seal, 13-dust-proof and shock-absorbing rubber sleeve, 14-damping block, 15-bracket, 16-interval, 17-keyway dust-proof Oil seal, 18-cross shaft, 19-flange flange.

detailed description

It should be noted that, in the case of no conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

The present invention will be described in detail below with reference to the accompanying drawings and examples.

1 and 2 show a transmission shaft structure 1 provided by an embodiment of the present invention. As shown in Figures 1 and 2, the drive shaft structure 1 of the present invention includes a bearing 2, a spline sleeve 5, a spline shaft 7 and a shock absorbing support device 4, wherein the bearing 2 and the shock absorbing support device 4 form the structure of the drive shaft. An intermediate support structure, and the outer ring 3 of the bearing 2 is provided with a shock absorbing support device 4, which can be fixedly supported on the vehicle body, such as a vehicle body or a vehicle frame, and the spline sleeve 5 is assembled on the bearing through a spline structure In the inner ring 6 of the bearing 2, for example, the outer peripheral surface of the spline sleeve 5 is designed with involute splines or rectangular splines, and the inner surface of the inner ring 6 of the bearing 2 is designed with a matching inner spline At the same time, the spline shaft 7 is assembled in the spline sleeve 5 through a keyway structure and can be axially expanded and contracted. For example, the inner peripheral surface of the spline sleeve 5 is designed with internal splines such as rectangular splines or involute splines, The outer peripheral surface of the spline shaft 7 is designed with external splines engaged with it to achieve axial expansion and contraction. Of course, the above-mentioned internal and external splines can be interchanged in design.

In this way, through this technical solution, since a part forming the telescopic spline structure, that is, the spline sleeve 5 is assembled in the inner ring 6 of the bearing 2 through the above-mentioned spline structure, and the outer ring 3 of the bearing 2 is provided with a shock-absorbing support Device 4, the shock absorbing support device 4 can be fixedly supported on the car body in actual assembly, and at the same time, another part forming the telescopic spline structure, namely the spline shaft 7, is assembled in the spline sleeve 5 through the above-mentioned keyway structure and Axial expansion and contraction is possible. In this way, the telescopic spline structure of the present invention is arranged in the intermediate support structure of the transmission shaft, that is, on the bearing 2 and the shock absorbing support device 4. In this way, it can significantly reduce or solve the problem of the transmission shaft due to poor mass distribution. The problem of vibration and noise caused by uniform rotation imbalance, meanwhile, can also make full use of the vibration isolation capability of the shock-absorbing support device 4 of the intermediate support structure to absorb the stretching resistance or rotation imbalance force of the telescopic spline structure, with good performance The energy absorption and vibration isolation effect significantly improves the NVH performance of the transmission system.

As mentioned above, in the prior art, when the whole vehicle bumps, the rear final drive moves relative to the intermediate support structure. Since the telescopic spline structure is arranged on the other side of the intermediate support structure, the rear final drive is relatively The relative displacement of the intermediate support structure can only be compensated by the deformation of the rubber sleeve of the intermediate support structure. On the one hand, it is easy to cause axial vibration and reduce the NVH performance of the transmission system. On the other hand, it reduces the durability of the rubber sleeve and even leads to Rubber sleeves fail early. Therefore, to completely solve this technical problem, in the transmission shaft structure of the present invention, as shown in Figures 1 and 2, the spline sleeve 5 can be axially expanded and contracted relative to the inner ring 6 of the bearing 2 through the above-mentioned spline structure, for example, Axial movement can be realized between the inner splines on the inner ring 6 of the above-mentioned bearing 2 and the involute splines or rectangular splines on the spline sleeve 5, that is, in the further preferred transmission shaft structure of the present invention , a two-way telescopic spline structure is provided, and the telescopic spline structure at this time includes the spline structure between the spline sleeve 5 and the inner ring 6, as well as the keyway structure before the spline shaft 7 and the spline sleeve 5, In this way, during the movement of the vehicle, such a telescopic spline structure can not only meet the expansion and contraction requirements of the front section of the intermediate support structure, but also meet the expansion and contraction requirements of the rear section of the intermediate support structure, and the expansion and contraction length can be adjusted according to the needs of the vehicle. Make the actual settings. At the same time, the two-way telescopic spline structure is arranged in the middle support structure of the transmission shaft, which has a good energy absorption and vibration isolation effect, improves the NVH performance of the transmission system, and further reduces the weight and cost of the transmission shaft.

In addition, on the basis of the above, further, or alternatively, as shown in Figures 1 and 2, in the transmission shaft structure 1 of the present invention, the end of the spline sleeve 5 away from the spline shaft 7 passes through the universal joint flange The fork 8 is connected with a cross shaft 18, and at the same time, the end of the spline shaft 7 away from the spline sleeve 5 is connected with another cross shaft 18 through another universal joint flange fork 8, and the cross shaft 18 can be connected with the flange flange 19 ,As shown in Figure 1. In this way, since the two sides of the telescopic spline structure are provided with structures such as the above-mentioned universal joint flange fork 8 and the cross shaft 18, after the layout design of the transmission shaft is completed, the telescopic spline structure can be arranged in the middle support structure The cooperation in the middle can ensure that the axis of the telescopic spline structure is collinear with the axis of the intermediate support structure, effectively avoiding the problems caused by the arrangement of the various sections of the transmission shaft such as the cross shaft when the telescopic spline structure is arranged on one side in the prior art. There is an angle between the axis of the telescopic spline structure and the axis of the intermediate support structure, which eventually leads to the problem of vibration of the transmission shaft, that is, the problem of unbalance.

Of course, on the basis of the above, in a preferred structure of the transmission shaft structure 1 of the present invention, as shown in FIG. On the outer ring 3 of the bearing 2, that is, the cross-sectional shape of the sheet metal cover 9 is a U-shaped structure with sides 11, the U-shaped structure can be interference fit on the outer ring 3 of the bearing 2, and the two sides of the sheet metal cover 9 A spline dust-proof oil seal 10 is provided between the side 11 of the spline cover 5 and the outer peripheral surface of the spline sleeve 5, and the spline dust-proof oil seal 10 can be vulcanized on the side 11 of the sheet metal cover 9, thereby preventing the entry of foreign impurities and dust, etc. into the spline structure described above.

Furthermore, as shown in FIG. 2 , the side edges 11 on both sides of the sheet metal cover 9 axially extend away from the bearing 2 on both sides of the bearing 2 , so that the spline dustproof oil seal 10 can be provided, for example, vulcanized on the entire side 11 On the inner surface, thereby improving the reliability and stability of the spline dustproof oil seal 10, and keeping the space between the oil seal part 12 of the spline dustproof oil seal 10 that is in contact with the outer peripheral surface of the spline sleeve 5 and the side surface of the bearing 2 16. Through this gap 16, it can be ensured that when the spline sleeve 5 expands and contracts axially relative to the inner ring 6, the oil seal portion 12 will not have an adverse effect on the bearing 2.

In addition, on the basis of the above, the shock absorbing support device 4 may include a sheet metal cover 9. At this time, when a spline dustproof oil seal 10 is arranged between the shock absorbing support device 4 and the outer peripheral surface of the spline sleeve 5, the spline When the key dust-proof oil seal 10 is fixedly connected to the shock-absorbing support device 4 and is interference fit with the outer peripheral surface of the spline sleeve 5, as mentioned above, the spline dust-proof oil seal 10 is arranged on the sheet metal cover 9 and the spline sleeve 5 between.

Of course, if the shock absorbing support device 4 of the present invention is not provided with the sheet metal cover 9, a spline dustproof oil seal 10 may also be provided between the shock absorbing support device 4 and the outer peripheral surface of the spline sleeve 5. , The spline dustproof oil seal 10 is fixedly connected to the shock absorbing support device 4 and is interference fit with the outer peripheral surface of the spline sleeve 5 .

Further, or alternatively, as shown in Figures 1 and 2, in a specific structural form of the shock-absorbing support device 4, the shock-absorbing support device 4 includes a dust-proof and shock-absorbing rubber sleeve 13, a shock-absorbing block 14 and Bracket 15, wherein the dust-proof and shock-absorbing rubber sleeve 13 is assembled on the outer ring 3 of the bearing 2 through its own groove, for example, as mentioned above, in the case of a sheet metal cover 9, the sheet metal cover 9 first It can be interference fit on the outer ring 3, and then the dust-proof and shock-absorbing rubber sleeve 13 is interference-fit on the sheet metal cover 9, or, in the absence of the sheet metal cover 9, the dust-proof and shock-absorbing rubber sleeve 13 can pass through itself The groove part is directly assembled on the outer ring 3 of the bearing 2, and the damping block 14 is arranged in the inner cavity of the dustproof and shock absorbing rubber sleeve 13, and the bracket 15 is arranged on the outer surface of the dustproof and shock absorbing rubber sleeve 13 to It can be fixedly supported on the car body, so that through the energy absorption and vibration reduction of the dust-proof and shock-absorbing rubber sleeve 13 and the shock-absorbing block 14, the expansion and contraction resistance or the unbalanced rotation force of the telescopic spline structure can be significantly absorbed, and torque transmission is provided. NVH performance in the process.

Furthermore, in order to facilitate molding and improve the reliability of shock absorption, preferably, the dust-proof shock-absorbing rubber sleeve 13, the shock-absorbing block 14 and the bracket 15 are vulcanized to form an integrated structure. Of course, these three can also be formed in other ways such as screws and other connectors to assemble together.

Of course, while the spline structure between the spline sleeve 5 and the inner ring 6 is provided with a spline dustproof oil seal 10, as shown in FIG. A keyway dust-proof oil seal 17 is arranged between them, and the keyway dust-proof oil seal 17 is fixedly connected to the outer peripheral surface of the spline sleeve 5 and interferes with the outer peripheral surface of the spline shaft 7 to prevent external impurities or dust from entering.

In addition, the present invention also provides a transmission shaft, wherein the transmission shaft is provided with the above transmission shaft structure 1 .

As mentioned above, through the propeller shaft structure 1 of the present invention, the NVH performance of the propeller shaft of the present invention and the vehicle using the propeller shaft will be significantly improved.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the scope of the present invention. within the scope of protection.

Claims (10)

1. a kind of transmission shaft structure, it is characterised in that the transmission shaft structure (1) includes：

Bearing (2), the outer ring (3) of the bearing (2) is provided with shock-absorbing supporting device (4), described Shock-absorbing supporting device (4) can be fixedly supported on car body；

Spline housing (5), the spline housing (5) is assemblied in the interior of the bearing (2) by spline structure In circle (6)；

Splined shaft (7), the splined shaft (7) is assemblied in the spline housing (5) by keyway arrangements And being capable of axial stretching.

2. transmission shaft structure according to claim 1, it is characterised in that the spline housing (5) Can be relative to the inner ring (6) axial stretching of the bearing (2) by the spline structure.

3. transmission shaft structure according to claim 1, it is characterised in that the spline housing (5) One end away from the splined shaft (7) is connected with cross axle (18) by universal joint flange fork (8)；

The splined shaft (7) passes through another universal joint flange away from one end of the spline housing (5) Fork (8) is connected with another cross axle (18).

4. transmission shaft structure according to claim 1, it is characterised in that the shock-absorbing supporting device (4) including metal plate cover (9), the metal plate cover (9) is assemblied in the bearing (2) by the recess of itself The outer ring (3) on, and the metal plate cover (9) both sides side (11) and the spline housing (5) Outer peripheral face between be provided with spline anti-dust seal (10).

5. transmission shaft structure according to claim 4, it is characterised in that the metal plate cover (9) The side (11) of both sides is axially extending away from the bearing (2) in the both sides of the bearing (2), makes Obtaining the spline anti-dust seal (10) can be arranged on the whole inner surface of the side (11), and And cause the oil sealing portion contacted with the spline housing (5) outer peripheral face of the spline anti-dust seal (10) (12) interval (16) is kept and the side of the bearing (2) between.

6. the transmission shaft structure according to any one in claim 1-5, it is characterised in that described Spline anti-dust seal (10) is provided between the outer peripheral face of shock-absorbing supporting device (4) and the spline housing (5), The spline anti-dust seal (10) be fixedly connected on the shock-absorbing supporting device (4) and with the flower The outer peripheral face interference fit of key set (5).

7. the transmission shaft structure according to any one in claim 1-5, it is characterised in that described Shock-absorbing supporting device (4) includes dust-proof damping gum cover (13), damping block (14) and support (15), Wherein, the dust-proof damping gum cover (13) is assemblied in the bearing (2) by the concave part of itself On the outer ring (3), the damping block (14) is arranged on the interior of the dust-proof damping gum cover (13) In chamber, the support (15) is arranged on the outer surface of the dust-proof damping gum cover (13) that can consolidate Surely it is supported on the car body.

8. transmission shaft structure according to claim 7, it is characterised in that the dust-proof damping gum cover (13), the damping block (14) and the support (15) vulcanization forms integrative-structure.

9. transmission shaft structure according to claim 1, it is characterised in that the spline housing (5) Running-on and the outer peripheral face of the splined shaft (7) between be provided with keyway anti-dust seal (17), the key Groove anti-dust seal (17) be fixedly connected on the outer peripheral face of the spline housing (5) and with the splined shaft (7) outer peripheral face interference fit.

10. a kind of power transmission shaft, it is characterised in that the power transmission shaft is provided with according in claim 1-9 Transmission shaft structure (1) described in any one.