Large-swing-angle transmission shaft assembly

Abstract

The large-swing-angle transmission shaft assembly comprises a joint fork, a welding shaft body, a welding shaft sleeve, a shaft body connecting handle, a main shaft, a roller pin and an inclined face, the welding shaft body is rotationally arranged in the joint fork and composed of the welding shaft sleeve, the shaft body connecting handle and the main shaft, the welding shaft sleeve is arranged at one end of the shaft body connecting handle, and the roller pin is arranged at the other end of the shaft body connecting handle. A main shaft is arranged at the other end of the shaft body connecting handle, a plurality of roller pins are arranged in the main shaft, an inclined face is formed between the inner side of the shaft body connecting handle and the side wall of the main shaft, and the inclined face is used for decomposing transverse conduction force into transverse force and vertical force and can reduce the stress of the roller pins. According to the large-angle rotation structure, the main shaft can make contact with the inclined face, transverse conduction force is decomposed into transverse force and vertical force, and therefore the stress at the position of a roller pin on the upper portion is reduced, large-angle rotation of the large-angle rotation structure is achieved, and the service life of the large-angle rotation structure is prolonged.

Description

Technical Field

[0001] The invention relates to the technical field of mechanical parts, in particular to the technical field of a large swing angle transmission shaft assembly. Background Art

[0002] The universal joint is a component that realizes variable angle power transmission between rotating shafts. The structure and function of the universal joint are similar to the joints on the human limbs. It allows the angle between the connected parts to change within a certain range. In order to meet the power transmission, adapt to the steering and the angle changes caused by the up and down bounces generated when the car is running, the drive axle of the front-drive car is often connected by a universal joint between the half shaft and the wheel axle. The combination of the universal joint and the drive shaft is called a universal joint transmission device. In front-engine rear-wheel drive vehicles, the universal joint transmission device is installed between the transmission output shaft and the input shaft of the drive axle final reducer, while the front-engine front-wheel drive vehicle omits the drive shaft, and the universal joint is installed on the front axle half shaft that is responsible for both driving and steering. The application field of the universal joint drive shaft is very wide. For example, in the field of mechanical manufacturing, it can solve the problems of offset, vibration and winding in multi-axis connection. At the same time, it can also realize the conversion of high-speed operation and low-speed output. For example, in the aerospace field, it can realize flexible adjustment of the angle of the wing to improve the stability and safety of aircraft take-off and landing. For example, in the automotive field, it can effectively solve the vibration and displacement problems caused by excessive angle when the car turns. For example, in the field of medical equipment, it can be used in surgical robotic arms, radiotherapy devices and other equipment to achieve accurate surgical positioning and treatment, and improve the success rate of surgery and treatment effect. In short, the universal joint drive shaft is an indispensable part of mechanical components.

[0003] In order to achieve lightweight, the drive shaft of the existing technology generally adopts lightweight materials such as aluminum alloy and carbon fiber to achieve the purpose of reducing the weight of parts. However, such lightweight materials are generally expensive, which increases the cost of the drive shaft. At the same time, it also increases the difficulty of production. The process is complicated and there are still technical deficiencies. There are also quality risks in the connection between carbon fiber and steel. Delamination is prone to occur between different materials, which reduces product strength and causes quality accidents.

[0004] In order to solve the problems raised in the background technology, for example, publication number CN116044714A discloses a lightweight universal joint, a spline fitting pair and a transmission shaft. By connecting the ball socket to an external part through a fixed wing, when the connection size of the external part changes, it can be adapted by changing the fixed wing, so that the change of the external connection size no longer affects the structure of the ball socket, and the standardized mass production of the ball socket can be realized, which meets the mass production requirements of automobiles. The stress state of the universal joint is completely improved through structural optimization design, so that the torque transmission is mainly completed through the fixed wing, bearing, straight shaft, rolling body and ball head, so that the main structure of the ball socket no longer bears the task of transmitting torque, and the ball socket mainly bears the function of oil storage and sealing, which fundamentally reduces the load of the ball socket, so that the ball socket can realize a lighter structural design such as injection molding or stamping, saves material utilization, improves product performance and quality, and reduces costs. However, the structure still has the following shortcomings: 1. In this structure, when the ball head rotates on the ball socket, it cannot achieve a large angle rotation, because when the ball head rotates, the force on the needle roller will gradually shift from the lateral force to the top of the needle roller, resulting in an unstable force angle and limiting the rotation; 2. The transmission shaft of the prior art uses a universal joint as a connection, and the maximum swing angle is 15°. After exceeding 15°, the service life of the product will decrease in an unconventional proportion, ultimately resulting in the product failing to reach its initial service life and causing quality accidents. Summary of the invention

[0005] The purpose of the present invention is to solve the problems in the prior art and to propose a large swing angle transmission shaft assembly, which can decompose the laterally transmitted force into lateral and vertical forces through the contact between the main shaft and the inclined surface, thereby reducing the force on the upper needle roller, and then enabling the structure to achieve large angle rotation, thereby increasing the service life.

[0006] To achieve the above-mentioned purpose, the present invention proposes a large swing angle transmission shaft assembly, including a yoke, a welded shaft body, a welded shaft sleeve, a shaft connecting handle, a main shaft, a needle roller, and an inclined surface. The welded shaft body is rotatably arranged in the yoke, and the welded shaft body is composed of a welded shaft sleeve, a shaft connecting handle, and a main shaft. A welding sleeve is arranged at one end of the shaft connecting handle, and a main shaft is arranged at the other end of the shaft connecting handle. A plurality of needle rollers are arranged inside the main shaft, and an inclined surface is formed between the inner side of the shaft connecting handle and the side wall of the main shaft. The inclined surface is used to decompose the laterally transmitted force into lateral and vertical forces, and can reduce the force applied to the needle roller.

[0007] Preferably, an ear hole is provided at the upper end of the yoke, and shaft sleeves are installed at the upper and lower ends of the main shaft. The ear hole is in contact with and cooperates with the shaft sleeve at the upper end of the main shaft to transmit torque, and the shaft connecting handle can rotate around the main shaft.

[0008] Preferably, the needle roller is located at the four inner corners of the main shaft, a sealing ring is provided at one end of the needle roller, and a needle roller retaining ring is provided at the other end of the needle roller, the sealing ring is close to the direction of the shaft connecting handle, and the needle roller retaining ring is close to the direction of the yoke.

[0009] Preferably, the sealing ring and the needle roller retaining ring are both made of elastically deformable rubber material.

[0010] Beneficial effects of the present invention: 1. The present invention can reduce the force on the needle roller by using the yoke, the welded shaft body and the inclined surface in coordination. The contact between the main shaft and the inclined surface can decompose the force transmitted laterally into the horizontal and vertical directions, thereby reducing the force on the upper needle roller. Since the inclined contact surface reduces the force on the upper needle roller, the structure can achieve large-angle rotation. The force on the needle roller is smaller than that of the original structure, and can withstand a larger swing angle. The larger the swing angle, the greater the force on the needle roller. The use of the inclined contact surface in contact with the main shaft can make the force on the structure more stable and have a longer service life, solving the problem that the force on the needle roller is unstable and cannot withstand a larger swing angle. The maximum swing angle of the current conventional transmission shaft is within 15°. After the structural improvement of the present invention, the maximum swing angle can reach 45° under the premise of unchanged performance, which can meet more usage scenarios. In the usage scenario of large swing angle (swing angle exceeding 15°), the conventional transmission shaft will experience nonlinear attenuation of life. The present invention can avoid this situation through structural optimization, thereby improving the service life. 2. The present invention replaces the traditional cross-axis universal joint and double yoke connection by transmitting torque through the main shaft and a single yoke, thereby reducing the number of yokes used. The main shaft is lighter than the traditional universal joint structure, thereby reducing the weight of the product. The total weight of the improved product can be reduced by 25-30% compared with the traditional structure drive shaft, achieving product lightweighting and meeting national energy conservation and emission reduction requirements.

[0011] The features and advantages of the present invention will be described in detail through embodiments in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a front view of a large swing angle transmission shaft assembly of the present invention; Figure 2 It is a rear view of a large swing angle transmission shaft assembly of the present invention; Figure 3 It is a side view of a large swing angle transmission shaft assembly of the present invention; Figure 4 It is a cross-sectional view of a large swing angle transmission shaft assembly of the present invention; Figure 5 It is a top view of a large swing angle transmission shaft assembly of the present invention; In the figure: 1-yoke, 2-welded shaft body, 21-welded shaft sleeve, 22-shaft body connecting handle, 23-main shaft, 3-needle roller, 4-inclined surface, 5-ear hole, 6-sealing ring, 7-needle roller retaining ring. DETAILED DESCRIPTION

[0013] See also Figures 1 to 5 The present invention discloses a large swing angle transmission shaft assembly, comprising a yoke 1, a welded shaft body 2, a welded shaft sleeve 21, a shaft connecting handle 22, a main shaft 23, a needle roller 3, and an inclined surface 4. The welded shaft body 2 is rotatably arranged in the yoke 1. The welded shaft body 2 is composed of a welded shaft sleeve 21, a shaft connecting handle 22, and a main shaft 23. A welding shaft sleeve 21 is arranged at one end of the shaft connecting handle 22, and a main shaft 23 is arranged at the other end of the shaft connecting handle 22. A plurality of needle rollers 3 are arranged inside the main shaft 23. An inclined surface 4 is formed between the inner side of the shaft connecting handle 22 and the side wall of the main shaft 23. The inclined surface 4 is used to decompose the laterally transmitted force into the lateral direction and the vertical direction, and can reduce the force applied to the needle roller 3. An ear hole 5 is arranged at the upper end of the yoke 1. The upper and lower ends of 23 are equipped with shaft sleeves, and the ear holes 5 are in contact with the shaft sleeves at the upper end of the main shaft 23 to transmit torque. The shaft connecting handle 22 can rotate around the main shaft 23. Through the coordinated use of the yoke 1, the welding shaft body 2, and the inclined surface 4, the force on the needle roller 3 can be reduced. Through the contact between the main shaft 23 and the inclined surface 4, the laterally transmitted force can be decomposed into lateral and vertical forces, thereby reducing the force on the upper needle roller 3. Since the inclined contact surface reduces the force on the upper needle roller 3, the structure can achieve a large-angle rotation. The force on the needle roller 3 is smaller than that of the original structure, and it can withstand a larger swing angle. The larger the swing angle, the greater the force on the needle roller. In addition, the use of an inclined contact surface in contact with the main shaft 23 can make the force of the structure more stable and have a longer service life.

[0014] See also Figure 3 and Figure 4 The present invention provides a large swing angle transmission shaft assembly, wherein the needle roller 3 is located at the four inner corners of the main shaft 23, a sealing ring 6 is provided at one end of the needle roller 3, and a needle roller retaining ring 7 is provided at the other end of the needle roller 3, the sealing ring 6 is close to the shaft connecting handle 22, and the needle roller retaining ring 7 is close to the yoke 1, and the sealing ring 6 and the needle roller retaining ring 7 are both made of elastically deformable rubber material, which can effectively maintain the sealing of grease.

[0015] See also Figure 2 and Figure 5The present invention provides a large swing angle transmission shaft assembly, wherein the outer side wall of the main shaft 23 contacts the inclined surface 4. The contact between the main shaft 23 and the inclined surface 4 can reduce the force on the needle roller 3, thereby realizing a large angle rotation of the welding shaft body 2. The torque is transmitted through the contact and cooperation of the yoke 1, the ear hole 5, and the sleeve matching the main shaft 23. The shaft connecting handle 22 can rotate around the main shaft 23. When the welding shaft body 2 is rotating, the welding shaft body 2 can, under the action of the rotational force, enable the bearing to achieve the effect of force decomposition. Since the inclined surface 4 reduces the force on the needle roller 3, the performance and service life of the structure are improved.

[0016] Working process of the present invention: In the working process of a large swing angle transmission shaft assembly of the present invention, the force on the needle roller 3 can be reduced through the coordinated use of the yoke 1, the welded shaft body 2, and the inclined surface 4. The contact between the main shaft 23 and the inclined surface 4 can decompose the force transmitted laterally into lateral and vertical directions, thereby reducing the force on the upper needle roller 3. Since the inclined contact surface reduces the force on the upper needle roller 3, the structure can achieve large-angle rotation. The force on the needle roller 3 is smaller than that of the original structure, and can withstand a larger swing angle. The larger the swing angle, the greater the force on the needle roller. In addition, the use of the inclined contact surface in contact with the main shaft 23 can make the force of the structure more stable and have a longer service life. The thin-walled structure on the inner side of the yoke 1 can reduce part of the weight of the product. The built-in connection structure effectively reduces the weight and saves costs compared with traditional products, meets the requirements for lightweight development of automotive parts, and is conducive to long-term use.

[0017] The torque is transmitted through the contact and cooperation between the yoke 1, the ear hole 5, and the sleeve matching the main shaft 23. The shaft connecting handle 22 can rotate around the main shaft 23. When the welding shaft body 2 is rotating, the welding shaft body 2 can achieve the effect of force decomposition of the bearing under the action of the rotational force. The inclined surface 4 reduces the force on the needle roller 3, thereby improving the performance and service life of the structure.

[0018] The above embodiments are intended to illustrate the present invention, not to limit the present invention. Any solution that is a simple transformation of the present invention belongs to the protection scope of the present invention.

Claims

1. A large swing angle transmission shaft assembly, characterized in that: The invention comprises a yoke (1), a welding shaft body (2), a welding shaft sleeve (21), a shaft body connecting handle (22), a main shaft (23), a needle roller (3), and an inclined surface (4). The welding shaft body (2) is rotatably arranged in the yoke (1). The welding shaft body (2) is composed of a welding shaft sleeve (21), a shaft body connecting handle (22), and a main shaft (23). One end of the shaft body connecting handle (22) is provided with a welding shaft sleeve (21), and the other end of the shaft body connecting handle (22) is provided with a main shaft (23). A plurality of needle rollers (3) are arranged inside the main shaft (23). An inclined surface (4) is formed between the inner side of the shaft body connecting handle (22) and the side wall of the main shaft (23). The inclined surface (4) is used to decompose the transversely transmitted force into transverse and vertical forces, and can reduce the force applied to the needle rollers (3).

2. A large swing angle transmission shaft assembly as claimed in claim 1, characterized in that: An ear hole (5) is provided at the upper end of the yoke (1), and shaft sleeves are mounted at the upper and lower ends of the main shaft (23). The ear hole (5) is in contact with and cooperates with the shaft sleeve at the upper end of the main shaft (23) to transmit torque, and the shaft connecting handle (22) is rotatable around the main shaft (23).

3. A large swing angle transmission shaft assembly as claimed in claim 1, characterized in that: The needle roller (3) is located at the four inner corners of the main shaft (23); a sealing ring (6) is provided at one end of the needle roller (3); a needle roller retaining ring (7) is provided at the other end of the needle roller (3); the sealing ring (6) is close to the direction of the shaft connecting handle (22); and the needle roller retaining ring (7) is close to the direction of the yoke (1).

4. A large swing angle transmission shaft assembly as claimed in claim 3, characterized in that: The sealing ring (6) and the needle roller retaining ring (7) are both made of elastically deformable rubber material.

Images