Automobile output shaft with torque overload protection

Abstract

The utility model relates to the technical field of automobile output shafts, and discloses an automobile output shaft with torque overload protection, which comprises an output shaft body, one end of the output shaft body is fixedly connected with a coupler, one end of the coupler far away from the output shaft body is fixedly connected with a connecting shaft, and one end of the connecting shaft far away from the coupler is fixedly connected with a transmission column. A spline shaft is fixedly connected to the end, away from the transmission column, of the fixed shaft, a spline sleeve is slidably connected to the outer side of the spline shaft, a spring is fixedly connected to one end of the spline sleeve, a disc spring is fixedly connected to the end, away from the spline sleeve, of the spring, and a tooth column is fixedly connected to the end, away from the spring, of the disc spring; high-frequency small-amplitude torque fluctuation is absorbed through the springs, the disc springs cope with low-frequency large-amplitude overload impact, the springs and the disc springs are connected in series to form a graded protection mechanism of flexible buffering and rigid torque limiting, and then the torque overload protection effect is achieved.

Description

An automotive output shaft with torque overload protection Technical Field

[0001] This utility model relates to the field of automotive output shaft technology, specifically an automotive output shaft with torque overload protection. Background Technology

[0002] In automotive transmission systems, the output shaft, as a key component connecting the power source (such as the engine or transmission) and the actuators (such as the wheels), must continuously bear the torque transmission. However, under conditions such as rapid acceleration, sudden braking, impacts from off-road conditions, or transmission system failures, the output shaft is prone to torque overload, leading to shaft twisting, gear wear, or even breakage. This not only affects the stability of power transmission but may also cause safety accidents.

[0003] For example, CN203793288U discloses an automotive wiper output shaft. This output shaft includes an output shaft with an annular groove on its outer edge near the tail end for connection to an assembly bracket. A gear ring on the outer edge of the middle portion of the output shaft connects to a linkage mechanism. A truncated cone is located at the front end of the output shaft, and a fixed shaft at the front end of the cone connects to the wiper arm. A fastening thread is located on the outer edge of the front end of the fixed shaft. The front end of the output shaft is connected to a wiper blade via the fixed shaft. The meshing pattern on the rear side of the wiper blade engages with the spline pattern on the truncated cone. After the wiper blade is tightened by a nut and the fastening thread, it reciprocates along with the output shaft. The gear ring near the fixed shaft is connected to a worm gear mechanism, and the two torque points on the output shaft are close to each other.

[0004] However, there are shortcomings: during the driving process, if the vehicle encounters conditions such as rapid acceleration, sudden braking, impact from off-road conditions, or transmission system failure, the power output shaft is prone to torque overload, which can lead to shaft twisting, gear wear, or even breakage. This not only affects the stability of power transmission but may also cause safety accidents. Summary of the Invention

[0005] The purpose of this utility model is to provide an automotive output shaft with torque overload protection, so as to solve the problem mentioned in the background art that the power output shaft is prone to torque overload when the vehicle encounters conditions such as rapid acceleration, sudden braking, off-road impact, or transmission system failure during vehicle operation.

[0006] To solve the above-mentioned technical problems, this utility model is achieved through the following technical solution:

[0007] This utility model relates to an automotive output shaft with torque overload protection, comprising an output shaft body, a coupling fixedly connected to one end of the output shaft body, a connecting shaft fixedly connected to the end of the coupling away from the output shaft body, a transmission column fixedly connected to the end of the connecting shaft away from the coupling, a fixed shaft fixedly connected to the end of the transmission column away from the connecting shaft, a splined shaft fixedly connected to the end of the fixed shaft away from the transmission column, a splined sleeve slidably connected to the outer side of the splined shaft, a spring fixedly connected to one end of the splined sleeve, a disc spring fixedly connected to the end of the spring away from the splined sleeve, and a gear column fixedly connected to the end of the disc spring away from the spring.

[0008] As a preferred embodiment of the above technical solution, the spline sleeve is connected to the toothed column via a spring and a disc spring, wherein the spline sleeve and the spring are connected in series, and the disc spring and the toothed column are connected in series.

[0009] As a preferred embodiment of the above technical solution, a sealing ring is provided at the connection between the coupling and the connecting shaft. The sealing ring is made of fluororubber, and the coupling is fixedly connected to the connecting shaft through the sealing ring.

[0010] As a preferred embodiment of the above technical solution, the engagement length between the spline sleeve and the spline shaft is 2 / 3 of the axial length of the spline sleeve, and the inner wall of the spline sleeve is provided with a spiral lubricating oil groove.

[0011] As a preferred embodiment of the above technical solution, the spring and the disc spring are connected in series, and the ratio of the free length of the spring to the free height of the disc spring is 1.8-2.2.

[0012] As a preferred embodiment of the above technical solution, the inner wall of the gear post is provided with a guide groove, and the gear post is meshed with the driven gear through the guide groove.

[0013] Compared with the prior art, the beneficial effects of this utility model are:

[0014] I. This utility model incorporates a spring and a butterfly valve. The spring absorbs high-frequency, small-amplitude torque fluctuations, while the butterfly valve handles low-frequency, large-amplitude overload impacts. The ratio of the spring's free length to the butterfly valve's free height is 1.8-2.2, allowing the spring to deform before the butterfly valve during torque fluctuations. The spring absorbs high-frequency, small-amplitude torque fluctuations with its high elastic deformation. When encountering low-frequency, large-amplitude overload impacts, the spring deforms to its limit, while the butterfly valve continues to compress due to its high load-bearing capacity. Its increasing stiffness provides rigid support. The two valves are connected in series to form a graded protection mechanism of flexible buffering and rigid torque limiting. Furthermore, the series connection ensures that the total deformation of the elastic components is the sum of the two valves, extending the response time of overload protection and preventing the output bearing from being subjected to instantaneous peak torque.

[0015] Second, based on the above-mentioned beneficial effects, a spline sleeve is also provided. The meshing length between the spline sleeve and the spline shaft is 2 / 3 of the axial length of the spline sleeve. The 2 / 3 meshing length ensures transmission stability while reserving 1 / 3 of the axial movement for displacement buffering of the spline sleeve in case of overload. Then, the spiral lubricating oil groove guides the lubricating oil to be evenly distributed, reducing the friction coefficient of the spline meshing surface and reducing wear and heat generation. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 is a schematic diagram of the overall invention.

[0018] Figure 2 is a schematic diagram of the disc spring connection of this utility model;

[0019] Figure 3 is a schematic diagram of the spline sleeve connection of this utility model;

[0020] Figure 4 is a schematic diagram of the cross-sectional connection of the spline sleeve of this utility model.

[0021] The attached diagram lists the components represented by each number as follows:

[0022] In the diagram: 1. Output shaft body; 2. Coupling; 3. Connecting shaft; 4. Transmission column; 5. Fixed shaft; 6. Splined shaft; 7. Splined sleeve; 8. Spring; 9. Disc spring; 10. Gear column. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] To make the objectives, technical solutions, and advantages of this utility model clearer, the embodiments of this utility model will be described in further detail below with reference to the accompanying drawings.

[0025] Please refer to Figures 1-4. This utility model provides a technical solution: an automotive output shaft with torque overload protection, including an output shaft body 1, a coupling 2 fixedly connected to one end of the output shaft body 1, a connecting shaft 3 fixedly connected to the end of the coupling 2 away from the output shaft body 1, a transmission column 4 fixedly connected to the end of the connecting shaft 3 away from the coupling 2, a fixed shaft 5 fixedly connected to the end of the transmission column 4 away from the connecting shaft 3, a splined shaft 6 fixedly connected to the end of the fixed shaft 5 away from the transmission column 4, a splined sleeve 7 slidably connected to the outer side of the splined shaft 6, a spring 8 fixedly connected to one end of the splined sleeve 7, a disc spring 9 fixedly connected to the end of the spring 8 away from the splined sleeve 7, and a gear 10 fixedly connected to the end of the disc spring 9 away from the spring 8.

[0026] As one implementation method in this embodiment, please refer to Figures 1-2. The spline sleeve 7 is connected to the toothed column 10 through the spring 8 and the disc spring 9. The spline sleeve 7 and the spring 8 are connected in series, and the disc spring 9 and the toothed column 10 are connected in series.

[0027] Spring 8 absorbs high-frequency, small-amplitude torque fluctuations, while disc spring 9 handles low-frequency, large-amplitude overload impacts. The ratio of the free length of spring 8 to the free height of disc spring 9 is 1.8-2.2, allowing spring 8 to deform before disc spring 9 during torque fluctuations. Spring 8 absorbs high-frequency, small-amplitude torque fluctuations with its high elastic deformation. When encountering low-frequency, large-amplitude overload impacts, after spring 8 deforms to its limit, disc spring 9 continues to compress due to its large load-bearing capacity. It provides rigid support through its increasing stiffness characteristics. The two are connected in series to form a graded protection mechanism of flexible buffering and rigid torque limiting. Furthermore, the series connection ensures that the total deformation of the elastic components is the sum of the two, extending the response time of overload protection and preventing the output bearing from being subjected to instantaneous peak torque.

[0028] As one embodiment of this example, as shown in Figures 1 and 2, a sealing ring is provided at the connection between the coupling 2 and the connecting shaft 3. The sealing ring is made of fluororubber, and the coupling 2 is fixedly connected to the connecting shaft 3 through the sealing ring.

[0029] The sealing ring is made of fluororubber, which is oil-resistant and high-temperature resistant, making it suitable for the harsh working conditions of automotive transmission systems. The interference fit of the sealing ring prevents lubricating oil leakage, avoids wear caused by insufficient lubrication of the gearbox, and improves the life of the output shaft.

[0030] As one embodiment of this example, please refer to Figures 1-4. The meshing length between the spline sleeve 7 and the spline shaft 6 is 2 / 3 of the axial length of the spline sleeve 7, and the inner wall of the spline sleeve 7 is provided with a spiral lubricating oil groove.

[0031] By using 2 / 3 of the engagement length to ensure transmission stability, 1 / 3 of the axial movement is reserved for displacement buffering of the spline sleeve 7 in case of overload. Then, the lubricating oil is guided to be evenly distributed through the spiral lubricating oil groove, which reduces the friction coefficient of the spline engagement surface and reduces wear and heat generation.

[0032] As one implementation method in this embodiment, please refer to Figures 1-2. The spring 8 and the disc spring 9 are connected in series, and the ratio of the free length of the spring 8 to the free height of the disc spring 9 is 1.8-2.2.

[0033] The stiffness matching between spring 8 and disc spring 9 is optimized by using a ratio of 1.8-2.2. Spring 8 deforms before disc spring 9. Disc spring 9 provides rigid support in the later stage of overload, forming a graded protection of flexible buffer and rigid torsion limiting, avoiding premature failure of elastic components or drift of protection threshold due to stiffness mismatch.

[0034] As one embodiment of this invention, please refer to Figures 1-2. The inner wall of the gear post 10 is provided with a guide groove, and the gear post 10 is meshed with the driven gear through the guide groove.

[0035] The guide groove engages with the guide boss of the spline sleeve 7 (radial clearance 0.1-0.2mm) to restrict the axial movement trajectory of the spline sleeve 7 and prevent jamming caused by offset during overload. Furthermore, the gear 10 meshes with the driven gear through the guide groove, integrating the overload protection mechanism with the transmission system, reducing space occupation and assembly errors.

[0036] Working principle: When the automotive output shaft with torque overload protection is working, power is transmitted from the output shaft body 1 through the coupling 2, connecting shaft 3, transmission column 4, and fixed shaft 5 to the spline shaft 6, and then transmitted to the spline sleeve 7 through spline engagement. When the system encounters torque fluctuations, because the ratio of the free length of spring 8 to the free height of disc spring 9 is 1.8-2.2, spring 8 deforms before disc spring 9 to absorb high-frequency small fluctuations. When the torque continues to increase, disc spring 9 compresses to deal with low-frequency large impacts, forming graded protection. At the same time, the 1 / 3 axial movement allowance reserved between spline sleeve 7 and spline shaft 6 allows it to move axially along the gear column 10. Energy is absorbed by the compression of spring 8 and disc spring 9. The guide groove on the inner wall of gear column 10 and the guide boss of spline sleeve 7 cooperate to limit the movement trajectory and prevent jamming. The sealing ring at coupling 2 and connecting shaft 3 prevents lubricating oil leakage. The spiral oil groove on the inner wall of spline sleeve 7 reduces frictional heat generation. After overload, spring 8 and disc spring 9 reset, allowing the output shaft to resume normal transmission.

[0037] The preferred embodiments of this utility model disclosed above are merely illustrative of the present utility model. These preferred embodiments do not exhaustively describe all details, nor do they limit the utility model to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of this utility model, thereby enabling those skilled in the art to better understand and utilize it. This utility model is limited only by the claims and their full scope and equivalents.

Claims

1. An automotive output shaft with torque overload protection, characterized in that: The device includes an output shaft body (1), one end of which is fixedly connected to a coupling (2), the end of which is away from the output shaft body (1) is fixedly connected to a connecting shaft (3), the end of which is away from the coupling (2) is fixedly connected to a transmission column (4), the end of which is away from the connecting shaft (3) is fixedly connected to a fixed shaft (5), the end of which is away from the transmission column (4) is fixedly connected to a spline shaft (6), a spline sleeve (7) is slidably connected to the outside of the spline shaft (6), a spring (8) is fixedly connected to one end of the spline sleeve (7), a disc spring (9) is fixedly connected to the end of the spring (8) away from the spline sleeve (7), and a toothed column (10) is fixedly connected to the end of the disc spring (9) away from the spring (8).

2. The automotive output shaft with torque overload protection according to claim 1, characterized in that: The spline sleeve (7) is connected to the toothed column (10) via a spring (8) and a disc spring (9). The spline sleeve (7) and the spring (8) are connected in series, and the disc spring (9) and the toothed column (10) are connected in series.

3. The automotive output shaft with torque overload protection according to claim 1, characterized in that: A sealing ring is provided at the connection between the coupling (2) and the connecting shaft (3). The sealing ring is made of fluororubber. The coupling (2) is fixedly connected to the connecting shaft (3) through the sealing ring.

4. The automotive output shaft with torque overload protection according to claim 2, characterized in that: The meshing length between the spline sleeve (7) and the spline shaft (6) is 2 / 3 of the axial length of the spline sleeve (7), and the inner wall of the spline sleeve (7) is provided with a spiral lubricating oil groove.

5. The automotive output shaft with torque overload protection according to claim 2, characterized in that: The spring (8) and the disc spring (9) are connected in series, and the ratio of the free length of the spring (8) to the free height of the disc spring (9) is 1.8-2.

2.

6. The automotive output shaft with torque overload protection according to claim 2, characterized in that: The inner wall of the toothed column (10) is provided with a guide groove, and the toothed column (10) is meshed with the driven gear through the guide groove.

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