A kind of automobile speed reducer, FWD gearbox, automobile

Abstract

The utility model discloses a kind of automobile speed reducer and the FWD gearbox, car of applying it, the automobile speed reducer includes input gear, sprocket chain, planetary gear system and anti-shake block;Wherein, input gear connects automobile power source, planetary gear system contains sun gear, planetary gear, planet carrier and inner ring gear, wherein sun gear and input gear constitute chain drive by sprocket chain, inner ring gear connects automobile differential;Anti-shake block's limit surface and sprocket chain inside and / or outside contact to limit its transmission trajectory.The scheme replaces traditional multistage gear drive with "chain drive+planetary gear system", so that the center distance of input gear and sun gear is more flexible, and the occupied space is smaller;Planetary gear system itself can realize speed reduction and adjust speed ratio, and has the characteristics of coaxial input and output, so that the structure is more compact, and the output is more stable.Anti-shake block can inhibit sprocket chain shaking, reduce vibration and noise, so that transmission is more stable and reliable.

Description

Technical Field

[0001] This utility model relates to the field of automotive reducer technology, specifically to an automotive reducer, an FWD gearbox, and an automobile. Background Technology

[0002] The reducer in an electric vehicle is a key transmission component connecting the drive shaft and wheels. Its main function is to reduce the high speed of the vehicle's power source output shaft and amplify the output torque to meet the vehicle's driving requirements. It is typically a compact and efficient gearbox, and its main components are as follows: 1. Input shaft: Connected to the power output shaft of the car's drive motor / engine, receiving high-speed power from the power source.

[0003] 2. Driving gear: This is usually a small gear with a few teeth, mounted on the input shaft.

[0004] 3. Driven gear: This is usually a large gear with many teeth that meshes with the driving gear. Through the meshing of the large and small gears, the rotational speed is reduced and the torque is amplified.

[0005] 4. Differential: Connected to or integrated with the driven gear, its function is to distribute the decelerated power to the left and right wheels and allow the left and right wheels to rotate at different speeds when turning, ensuring smooth vehicle steering.

[0006] 5. Output shaft: Connects the differential and the drive wheels, ultimately transmitting power to the wheels.

[0007] 6. Housing: It houses all gears, shafts, and bearings, provides structural support, and seals the lubricant to reduce wear and dissipate heat.

[0008] Existing technologies employ two-stage / multi-stage gear transmission (driving gear + driven gear) for multi-stage speed reduction. However, since the number of teeth and the radius of the gears in the two-stage / multi-stage gears are fixed during assembly, the center distance between the driving gear and the driven gear is inconvenient to adjust and is relatively large (to achieve the speed reduction effect, the driven gear has more teeth and a larger radius). This results in problems such as the reducer occupying a large space and having a fixed speed ratio. Furthermore, the reducer gears often use helical gears with high stability, but helical gears have low gear transmission efficiency due to the presence of axial force. Utility Model Content

[0009] The purpose of this invention is to develop an automotive reducer to solve the problems of large space occupation and fixed speed ratio caused by two-stage / multi-stage gear transmission in existing automotive reducers, so as to make the spatial arrangement of the automotive reducer more compact, the center distance between gears more flexible, the speed ratio adjustable, and the transmission efficiency higher.

[0010] This utility model is achieved through the following technical solution: An automotive speed reducer, comprising: An input gear for drive connection to the power output shaft of a vehicle power source, including an engine and / or an electric motor; a toothed chain; A planetary gear system includes a sun gear, planetary gears, a planet carrier, and an internal gear ring. The sun gear and the input gear form a chain drive via a toothed chain. The internal gear ring is used for transmission connection with the vehicle's differential. A vibration damper is fixed to the internal support or housing of the vehicle's reducer. The vibration damper has a limiting surface that fits against the inner and / or outer side of the toothed chain to limit the transmission trajectory of the toothed chain. The beneficial effects of the above technical solution are as follows: This solution replaces the traditional two-stage or multi-stage gear transmission with a "chain drive and planetary gear system," making the center distance between the input gear and the sun gear more flexible. The planetary gear system itself can achieve deceleration, reducing the space occupied by all gears in the vehicle reducer and making the reducer's spatial arrangement more compact. At the same time, the deceleration ratio achieved through the planetary gear system can be adjusted according to actual needs by adjusting the speed ratio of the planetary gear system without changing the chain structure and the installation position of the sun gear, improving production and assembly efficiency. In addition, the planetary gear system has the characteristic of coaxial input and output, which can further make the reducer structure more compact and the output power more stable. The limiting surface of the anti-vibration block is used to guide the transmission trajectory of the toothed chain, prevent the toothed chain from shaking, ensure high efficiency of chain transmission, reduce vibration and noise during transmission, improve the smoothness and reliability of transmission, and give this reducer good NVH performance. NVH performance is one of the important standards for measuring the quality of automobile manufacturing, including noise, vibration and acoustic roughness.

[0011] The sun gear, planetary gears, planet carrier, and internal gear ring are all conventional structures of existing planetary gear systems. When the sun gear is in a fixed position and power is input from the sun gear and output from the planet carrier and internal gear ring, speed reduction and torque increase can be achieved. For specific principles, please refer to "Planetary Gear Transmission Design (Second Edition)" edited by Rao Zhengang. The document "https: / / baike.baidu.com / item / %E8%A1%8C%E6%98%9F%E9%BD%BF%E8%BD%AE%E4%BC%A0%E5%8A%A8%E8%AE%BE%E8%AE%A1%EF%BC%88%E7%AC%AC%E4%BA%8C%E7%89%88%EF%BC%89 / _blank" was published by Chemical Industry Press in October 2014; its reduction principle and detailed fit relationships of the various structures in the planetary gear system will not be elaborated here.

[0012] As those skilled in the art will understand, the anti-vibration block can only be positioned where it does not interfere with the "toothed chain-gear" transmission and will not affect the transmission of the toothed chain or the rotation of each gear. The limiting surface can be an arc surface or a plane, and can be attached to the outer side of the meshing section of the toothed chain and gear, or to the inner or outer side of the suspended section of the toothed chain located between the input gear and the sun gear. Preferably, the portion of the toothed chain located between the input gear and the sun gear is a suspended section, and the limiting surface is attached to the inner and / or outer side of the suspended section. By attaching the suspended section of the toothed chain to the limiting surface of the anti-vibration block, the vibration of the toothed chain during transmission can be more accurately suppressed, so that this reduction structure has both the advantages of chain transmission (high transmission efficiency, more flexible center distance between the input gear and the sun gear) and solves the problem of chain vibration at high speeds. This design allows the toothed chain to maintain a stable transmission trajectory even when suspended, avoiding friction, noise, and energy loss caused by chain vibration, further improving transmission smoothness and efficiency. Simultaneously, this configuration enhances the stability of the entire reducer structure, reducing potential component loosening or damage due to vibration and extending the reducer's service life. In one feasible embodiment, the input gear has an internal meshing gear section that coaxially meshes with the power output shaft of the vehicle's drive module. In another feasible embodiment, the toothed chain is a HY-VO toothed chain; the HY-VO toothed chain is a high-performance industrial transmission chain widely used in mechanical transmission. The HY-VO toothed chain possesses high strength, high wear resistance, and excellent transmission smoothness. Using it as a transmission element significantly improves the reducer's transmission efficiency and service life. Furthermore, the special structure of the HY-VO toothed chain results in lower noise during transmission, further improving the reducer's NVH performance and meeting the high-performance, low-noise requirements of automotive transmission systems. In one feasible embodiment, the anti-vibration block has a connecting portion on the side away from the limiting surface, the connecting portion having a connecting hole, and the connecting hole being fixedly connected to the internal bracket or housing of the vehicle reducer by bolts or pins. This utility model also provides an FWD (Front-Wheel Drive) transmission, including the vehicle reducer described above. This utility model also provides a vehicle, including the vehicle reducer described above. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the transmission structure of the input gear of this utility model, which forms a chain drive with the sun gear through a toothed chain (the planetary gears, planet carrier, and internal gear ring in the planetary gear system are not shown). Figure 2 for Figure 1 Another structural diagram from a different angle; Figure 3 for Figure 1 Side view; Figure 4 for Figure 1 A schematic diagram of the anti-shake block structure.

[0014] In the diagram: 1. Input gear; 11. Internal meshing gear section; 2. Planetary gear; 3. Toothed chain; 4. Anti-vibration block; 41. Limiting surface; 42. Connecting part. Detailed Implementation

[0015] First, those skilled in the art should understand that the following embodiments are merely used to explain the technical principles of the embodiments of this application and are not intended to limit the scope of protection of the embodiments of this application. Those skilled in the art can make adjustments as needed to adapt to specific application scenarios.

[0016] In the description of the embodiments of this application, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application based on the specific circumstances.

[0017] In the embodiments of this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0018] To make the objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments are described in detail below with reference to the accompanying drawings.

[0019] like Figures 1 to 4 As shown, this embodiment provides an automotive reducer, including: Input gear 1 is used for transmission connection with the power output shaft of the vehicle's power source, which includes an engine and / or an electric motor (i.e., the power mechanism of gasoline vehicles, electric vehicles, and hybrid vehicles); toothed chain 3; planetary gear system, including sun gear 2, planetary gears, planet carrier, and internal gear ring; the sun gear 2 and the input gear 1 form a chain drive through the toothed chain 3, and the internal gear ring serves as the output structure for deceleration power and is transmission connected to the vehicle's differential; anti-vibration block 4 is fixed on the internal bracket or housing of the vehicle's reducer, and the anti-vibration block 4 has a limiting surface 41, which fits against the inner and / or outer side of the toothed chain 3 to limit the transmission trajectory of the toothed chain 3. In this embodiment, a "chain drive and planetary gear system" replaces the traditional two- or multi-stage gear drive, making the center distance between the input gear 1 and the sun gear 2 more flexible. The sun gear in the planetary gear system has a fixed position and meshes with the planetary gears, which in turn mesh with the internal gear ring. In this embodiment, power is input from the sun gear. When the sun gear rotates, it drives the planetary gears to rotate and mesh within the internal gear ring, thereby causing the internal gear ring to rotate coaxially with the sun gear, achieving speed reduction and torque increase. This design reduces the space occupied by gears in the automotive reducer, making the reducer's spatial arrangement more compact. Simultaneously, the speed reduction achieved through the planetary gear system allows the speed ratio to be adjusted according to actual needs without changing the chain structure or gear mounting position, improving production and assembly efficiency. Furthermore, the planetary gear system's coaxial input and output characteristics further enhance the reducer's compact structure. The limiting surface of the anti-vibration block guides the transmission trajectory of the toothed chain, preventing chain vibration, reducing vibration and noise during transmission, improving transmission smoothness and reliability, and giving this reducer better NVH performance.

[0020] Compared to traditional multi-stage gear reducers, chain transmission has higher efficiency because the sprocket (sun gear) of the chain is a spur gear with no axial force component, while the multi-stage gear transmission in the reducer uses helical gears, which have axial force component during meshing, causing torque loss. In automotive reducers, to meet transmission performance requirements, helical gears with better transmission stability, stronger load-bearing capacity, lower noise, and higher overlap are used for meshing. The stability of the chain in conjunction with spur gears can reach the stability of helical gear meshing. In a preferred embodiment, the portion of the toothed chain 3 located between the input gear 1 and the sun gear 2 is a suspended section 31, and the limiting surface 41 is in contact with the inner and / or outer side of the suspended section 31. By aligning the suspended section 31 of the toothed chain with the limiting surface of the anti-vibration block 4, the vibration of the toothed chain during transmission can be more precisely controlled, so that this reduction structure has both the advantages of chain transmission and solves the problem of chain vibration at high speeds. This design allows the toothed chain to maintain a stable transmission trajectory even when suspended, avoiding friction, noise, and energy loss caused by chain vibration, further improving transmission smoothness and efficiency. Simultaneously, this configuration enhances the stability of the entire reducer structure, reducing potential component loosening or damage due to vibration and extending the reducer's service life. In one embodiment, the input gear 1 has an internal meshing gear section 11, which meshes coaxially with the power output shaft of the vehicle's drive module. In another embodiment, the toothed chain 3 is a HY-VO toothed chain. The HY-VO toothed chain is a high-performance industrial transmission chain widely used in mechanical transmission. It features high strength, high wear resistance, and excellent transmission smoothness. Using a HY-VO toothed chain as a transmission element significantly improves the reducer's transmission efficiency and service life. Furthermore, the special structure of the HY-VO toothed chain results in lower noise during transmission, further improving the reducer's NVH performance and meeting the high-performance, low-noise requirements of automotive transmission systems. In one embodiment, the anti-shake block 4 has a connecting portion 42 on the side away from the limiting surface 41. The connecting portion 42 has a connecting hole, which is fixedly connected to the internal bracket or housing of the vehicle reducer by bolts or pins. An embodiment of an FWD transmission is also provided, including any of the above-described vehicle reducer embodiments. An embodiment of a vehicle is also provided, including any of the above-described vehicle reducer embodiments.

[0021] In the description of the embodiments of this application, it should be noted that the terms "inner" and "outer" and other terms indicating direction or positional relationship are based on the direction or positional relationship shown in the drawings. This is only for the convenience of description and does not indicate or imply that the device or component must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this application.

[0022] In the description of this application, the reference to terms such as "this embodiment," "an embodiment," etc., means that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0023] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A car speed reducer, characterized in that, include: Input gear (1) is used for transmission connection with the power output shaft of the vehicle power source; Toothed chain (3); The planetary gear system includes a sun gear (2) and an internal gear ring; the sun gear (2) and the input gear (1) are connected by a toothed chain (3) to form a chain drive, and the internal gear ring is used to connect with the differential drive of the automobile. The anti-vibration block (4) is fixed on the internal bracket or housing of the car reducer. The anti-vibration block (4) has a limiting surface (41) that fits against the inner and / or outer side of the toothed chain (3) to limit the transmission trajectory of the toothed chain (3).

2. The automotive reducer according to claim 1, characterized in that: The portion of the toothed chain (3) located between the input gear (1) and the sun gear (2) is a suspended section (31), and the limiting surface (41) is in contact with the inner and / or outer side of the suspended section (31).

3. The automotive reducer according to claim 1, characterized in that: The input gear (1) has an internal meshing gear section (11) that meshes coaxially with the power output shaft of the vehicle drive module.

4. The automobile reducer according to any one of claims 1-3, characterized in that: The toothed chain (3) is a Hava toothed chain.

5. The automobile reducer according to any one of claims 1-3, characterized in that: The anti-shake block (4) has a connecting part (42) on the side away from the limiting surface (41). The connecting part (42) has a connecting hole, which is fixedly connected to the internal bracket or housing of the car reducer by bolts or pins.

6. An FWD transmission, characterized in that: Including the vehicle reducer as described in any one of claims 1-5.

7. A car, characterized in that: Including the vehicle reducer as described in any one of claims 1-5.

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