Transmission reverse gear system and reverse gear method

Abstract

The invention relates to a transmission reverse gear system and a reverse gear method. The transmission reverse gear system comprises a front shell used for fixedly installing a transmission; the input shaft is used for transmitting engine power; a planetary gear mechanism including a planet carrier, a sun gear, and a planet gear, the planet carrier being fixed to restrict rotation thereof; the speed reducing mechanism is connected with the planetary gear mechanism and used for driving an output shaft of the transmission; the gear shifting mechanism is used for selecting different gears to realize different reduction ratios; the output shaft is used for outputting the power after speed change; when the planet carrier is fixed, the planet gear mechanism can rotate in the direction opposite to the input shaft, and therefore reverse power output is achieved. According to the transmission reverse gear system, in the actual reversing process, multiple gears are continuously switched, one gear is smoothly switched to another gear, the reversing action does not need to be interrupted, meanwhile, the vehicle speed requirements of reversing under different conditions are met through different gears, and the driving flexibility and safety are remarkably improved.

Description

Technical Field

[0001] The present application relates to the technical field of commercial vehicle transmission systems, and in particular to a transmission reverse gear system and a reverse gear method. Background Art

[0002] With the continuous development of commercial vehicle transmission system technology, AMT (automatic mechanical transmission) transmissions are increasingly widely used in the field of commercial vehicles. AMT transmissions have gradually become the mainstream choice for commercial vehicle transmission systems due to their high efficiency, reliability and ease of operation. However, with the diversification and complexity of commercial vehicle transportation needs, the requirements for the versatility and high adaptability of AMT transmissions are also constantly increasing. Among them, how to flexibly adjust the performance parameters of the transmission according to different working conditions, especially the reverse gear ratio, to meet the needs of various complex working conditions such as heavy-load reverse starting and high-speed continuous reverse gear, has become an important direction for the development of current commercial vehicle transmission system technology.

[0003] In traditional heavy-duty multi-speed transmissions, in order to achieve the reverse function, most of them adopt a 12-speed or 16-speed design, and contain multiple pairs of gear pairs in the main box. This design uses an idler structure to achieve the reversal of the drive gear, thereby completing reverse driving. As a simple mechanical transmission method, the idler structure can meet the basic reversing needs to a certain extent, and can usually provide two reverse gear ratios. However, with the continuous upgrading of transportation needs, the traditional design of the idler structure has gradually exposed its limitations.

[0004] First, due to the limitation of the idler structure, it is difficult for traditional transmissions to achieve more reverse gear ratios. Under complex working conditions such as heavy-load reverse start or high-speed continuous reverse gear, vehicles need a wider range of speed ratio changes to adapt to different transportation needs. However, the two reverse gear ratios of traditional transmissions often cannot meet these needs, resulting in the vehicle being unable to obtain sufficient power or speed during the reverse process, affecting transportation efficiency; secondly, the idler structure also makes the structure of the transmission more complex. In order to accommodate multiple pairs of gear pairs and idlers, the volume and weight of the transmission have to be increased, which not only increases the manufacturing cost but also increases the difficulty of maintenance. In addition, the complex structure may also cause more failure points in the transmission during long-term use, reducing its reliability and durability; finally, the idler structure of the traditional transmission limits its adaptability to a certain extent. With the continuous changes in commercial vehicle transportation needs, vehicles need to operate under various complex working conditions. However, due to problems such as limited reverse gear ratios and complex structures, traditional transmissions often cannot adapt well to these changes. This results in the vehicle being unable to perform at its best under certain specific conditions, affecting transportation efficiency and economy.

[0005] Therefore, in order to solve the above technical problems, it is urgent to develop a transmission reverse gear system and a reverse gear method that can smoothly switch the reverse gear without interrupting the reverse action and is provided with multiple gears to match different reverse speed requirements. Summary of the invention

[0006] Based on this, it is necessary to provide a transmission reverse gear system and reverse gear method that can switch between multiple gears to achieve reverse driving at different vehicle speeds in order to address the above problems.

[0007] A transmission reverse gear system, used for achieving reverse driving at different vehicle speeds, comprising:

[0008] A front housing, used for fixing and installing the transmission;

[0009] Input shaft, used to transmit engine power;

[0010] A planetary gear mechanism including a planet carrier, a sun gear and planet gears, wherein the planet carrier is fixed to restrict its rotation;

[0011] A reduction mechanism connected to the planetary gear mechanism and used to drive the output shaft of the transmission;

[0012] A gear shift mechanism, used to select different gears to achieve different reduction ratios;

[0013] Output shaft, used to output the power after speed change;

[0014] When the planet carrier is fixed, the planetary gear mechanism can rotate in the opposite direction to the input shaft, thereby achieving reverse power output.

[0015] In one embodiment, the planetary gear mechanism further includes a reverse gear planetary gear ring, which has an internal and external tooth structure, wherein the internal teeth are used to cooperate with the reverse gear planetary wheel, and the external teeth are used to connect to the reduction mechanism.

[0016] In one of the embodiments, a transition structure is further included, wherein the transition structure is disposed between the reverse gear planetary ring gear in the planetary gear mechanism and the engagement structure on the front housing to achieve connection.

[0017] In one embodiment, the shift mechanism includes a plurality of shift sleeves, and the shift sleeves are meshed with gears in a planetary gear mechanism or a reduction mechanism to achieve different gear selections.

[0018] In one embodiment, the planetary gear mechanism and the shift mechanism are used to realize reverse gear and are located at the front end of the front auxiliary box of the transmission and are directly connected to the front housing of the transmission.

[0019] In one of the embodiments, when the transmission is shifted into reverse gear, the shift sleeve moves in a preset direction, so that the reverse gear sun gear is driven to rotate, and the reverse gear planetary gear interacts with the reverse gear planetary gear ring while rotating on its own, driving the gear ring to rotate in the opposite direction of the reverse gear sun gear, thereby realizing reverse rotation of the transmission output shaft.

[0020] In one of the embodiments, when the transmission is in reverse gear, the front auxiliary box synchronizer is in a neutral state to avoid causing load to the planetary gear mechanism.

[0021] A transmission reverse gear method comprises a vehicle body and a transmission reverse gear system, and the vehicle body is reversed by utilizing the transmission reverse gear system to output power.

[0022] The transmission reverse gear method is as follows:

[0023] Put the synchronizer sleeve of the front auxiliary box in the neutral position;

[0024] According to the required reverse speed, the gear combination is selected through the gear shift mechanism;

[0025] Reverse rotation and reduction ratio adjustment are achieved through planetary gear mechanisms and reduction mechanisms;

[0026] Output the shifted power for reversing.

[0027] In one of the embodiments, during the reverse gear process, the transmission reverse gear system selects and connects different gear combinations through the shift mechanism to achieve different reverse gear ratios and obtain different reverse speeds.

[0028] The above-mentioned transmission reverse gear system can realize smooth gear transition through the cooperation between the planetary gear mechanism of the front auxiliary box and the multiple gears and synchronous cones of the rear auxiliary box, and the precise operation of the shift mechanism. The driver can continuously change multiple gears during the reversing process as needed, so as to accurately control the reversing speed. This ability is particularly important in narrow spaces or complex road conditions, and can improve the flexibility and safety of reversing operations; in addition, by adjusting the planetary gear mechanism in the front auxiliary box and the combination of the gears and synchronous cones in the rear auxiliary box, different reverse gear ratios can be achieved. Therefore, whether it is necessary to reverse slowly to accurately control the distance or to reverse quickly to quickly leave the current position, suitable gear selection can be provided. This adaptability ensures that the driver can maintain precise control of the vehicle at different speeds. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The drawings constituting a part of this application are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0031] In addition, the drawings are not drawn to a 1:1 scale, and the relative sizes of various elements are drawn in the drawings only as examples and not necessarily according to the true scale.

[0032] FIG. 1 is a schematic diagram of the structure of a transmission reverse gear system in one embodiment.

[0033] FIG. 2 is a power flow diagram of the first reverse gear transmission in one embodiment.

[0034] Figure 3 This is a power flow diagram of the reverse second gear transmission in one embodiment.

[0035] Figure 4 This is a power flow diagram of the reverse third gear transmission in one embodiment.

[0036] Figure 5 This is a power flow diagram of a reverse fourth gear transmission in one embodiment.

[0037] Figure 6 This is a power flow diagram of a reverse fifth gear transmission in one embodiment.

[0038] Figure 7 This is a power flow diagram of a reverse six-speed transmission in one embodiment.

[0039] Description of reference numerals:

[0040] 1. Front housing; 2. Reverse gear seat; 3. First shaft; 4. Reverse gear sleeve; 5. Reverse gear engagement gear; 6. Reverse gear planetary carrier; 7. Reverse gear planetary wheel; 8. Reverse gear ring; 9. Left intermediate shaft; 10. Right intermediate shaft; 11. Front auxiliary box high gear input gear; 12. Left intermediate shaft reduction gear; 13. Right intermediate shaft reduction gear; 14. Front auxiliary box synchronizer sleeve; 15. Front auxiliary box low gear and third gear gear; 16. Left intermediate shaft third gear gear; 17. Right intermediate shaft third gear gear; 18. Second and third gear shift sleeve; 19. Second gear gear Wheel; 20, left intermediate shaft second gear; 21, right intermediate shaft second gear; 22, first gear; 23, left intermediate shaft first gear; 24, right intermediate shaft first gear; 25, first gear shift sleeve; 26, second shaft; 27, connecting sleeve; 28, sun gear; 29, planetary gear; 30, planetary gear ring; 31, planet carrier; 32, planet carrier shaft; 33, transition gear ring; 34, rear auxiliary case synchronizer gear seat; 35, shift sleeve; 36, high gear sync cone; 37, low gear sync cone; 38, middle housing; 39, rear housing;

[0041] 301, reverse gear sun gear;

[0042] 901, left reverse reduction gear;

[0043] 1001.Right reverse reduction gear. DETAILED DESCRIPTION

[0044] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0045] In the description of the present application, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0046] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, if the term "plurality" appears, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0047] In this application, unless otherwise clearly specified and limited, if the terms "installed", "connected", "connected", "fixed" and the like appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0048] In the present application, unless otherwise clearly specified and limited, if there is a description that a first feature is "above" or "below" a second feature, etc., or similar descriptions appear, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0049] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only implementation method.

[0050] Referring to FIG. 1 , FIG. 1 shows a schematic diagram of the structure of a transmission reverse gear system in an embodiment of the present application. The transmission reverse gear system provided in an embodiment of the present application includes a front housing 1, a reverse gear seat 2, a first shaft 3, a reverse gear sleeve 4, a reverse gear engaging tooth 5, a reverse gear planetary carrier 6, a reverse gear sun gear 301, a reverse gear planetary gear 7, a reverse gear planetary ring gear 8, a left intermediate shaft 9, a right intermediate shaft 10, a left reverse gear reduction gear 901, a right reverse gear reduction gear 1001, a front auxiliary box high gear input gear 11, a left intermediate shaft reduction gear 12, a right intermediate shaft reduction gear 13, a front auxiliary box synchronizer sleeve 14, a front auxiliary box low gear and a third intermediate shaft reduction gear 15, a front auxiliary box synchronizer sleeve 16, a front auxiliary box low gear and a third intermediate shaft reduction gear 17, a front auxiliary box synchronizer sleeve 18, a front auxiliary box synchronizer sleeve 19, a front auxiliary box synchronizer sleeve 20, a front auxiliary box synchronizer sleeve 21, a front auxiliary box synchronizer sleeve 22, a front auxiliary box synchronizer sleeve 23, a front auxiliary box synchronizer sleeve 24, a front auxiliary box synchronizer sleeve 25, a front auxiliary box synchronizer sleeve 26, a front auxiliary box synchronizer sleeve 27, a front auxiliary box synchronizer sleeve 28, a front auxiliary box synchronizer sleeve 29, a front auxiliary box synchronizer sleeve 30, a front auxiliary box synchronizer sleeve 31, a front auxiliary box synchronizer sleeve 32, a front auxiliary box synchronizer sleeve 33, a front auxiliary box synchronizer sleeve 34, a front auxiliary box synchronizer sleeve 35, a front auxiliary box synchronizer sleeve 36, a front auxiliary box synchronizer sleeve 37, a front auxiliary box synchronizer sleeve 38, a front auxiliary box synchronizer sleeve 39, a front auxiliary box synchronizer sleeve 40, a front auxiliary box synchronizer sleeve 41, a front The gear gear 15, the third gear gear 16 of the left intermediate shaft, the third gear gear 17 of the right intermediate shaft, the second and third gear shifting sleeve 18, the second gear gear 19, the second gear gear 20 of the left intermediate shaft, the second gear gear 21 of the right intermediate shaft, the first gear gear 22, the first gear gear 23 of the left intermediate shaft, the first gear gear 24 of the right intermediate shaft, the first gear shifting sleeve 25, the second shaft 26, the connecting sleeve 27, the sun gear 28, the planetary gear 29, the planetary gear ring 30, the planetary carrier 31, the planetary carrier shaft 32, the transition gear ring 33, the synchronizer gear seat 34 of the rear auxiliary box, the shifting sleeve 35, the high gear synchronizing cone 36, the low gear synchronizing cone 37, the middle housing 38 and the rear housing 39.

[0051] In one embodiment, the front housing 1 is used to fix the transmission assembly, and the reverse gear seat 2 is fixed to the front housing 1 by splines or bolts, serving as a fixed basis for the reverse gear system of the transmission to ensure the stability and reliability of the reverse gear system of the transmission; specifically, the front housing 1 is made of high-strength material to ensure that the front housing 1 has good rigidity and sealing performance, prevents leakage of oil inside the transmission, and improves the overall durability of the transmission.

[0052] In one embodiment, a shaft 3 is used as a power input shaft for transmitting the power of the engine to the transmission, and a reverse gear sun gear 301 is integrated on the shaft 3 as a power input end of the reverse gear planetary gear train.

[0053] In one embodiment, the reverse gear sleeve 4 is connected to the reverse gear seat 2 and the reverse gear engaging teeth 5 at the same time through splines. Through the spline connection, the reverse gear sleeve 4 can be closely matched with the reverse gear seat 2 and the reverse gear engaging teeth 5 at the same time to ensure stable transmission of power; the reverse gear engaging teeth 5 are fixedly connected to the reverse gear planetary carrier 6, so that the reverse gear planetary carrier 6 is relatively fixed to the front housing 1 and cannot rotate. By fixing the reverse gear planetary carrier 6, it can be ensured that the meshing of the gears during reversing is more stable to prevent friction or damage caused by rotation; at the same time, due to the fixation of the reverse gear planetary carrier 6, the transmission can better control the flow of power, so that a multiple reverse gear design can be realized. Multiple reverse gears mean that a suitable reverse gear can be selected in different environments (such as heavy load or high-speed reversing); finally, the stable reverse gear planetary carrier 6 can support the function of continuous shifting, allowing the driver to seamlessly switch reverse gear when needed, thereby improving the flexibility of operation.

[0054] In one embodiment, the reverse planetary gear train includes a reverse sun gear 301, a reverse planetary gear 7 and a reverse planetary gear ring 8; the reverse planetary gear 7 is meshed with the inner teeth 801 of the reverse sun gear 301 and the reverse planetary gear ring 8 at the same time to achieve power transmission and direction change; the outer teeth 802 of the reverse planetary gear ring 8 are respectively meshed with the left reverse reduction gear 901 on the left intermediate shaft 9 and the right reverse reduction gear 1001 on the right intermediate shaft 10 to transmit power to the left intermediate shaft 9 and the right intermediate shaft 10.

[0055] In one embodiment, the left intermediate shaft 9 and the right intermediate shaft 10 are respectively interference fitted with the left reverse gear reduction gear 901 and the right reverse gear reduction gear 1001, as well as other gears for transmitting and distributing power;

[0056] The reverse gear planetary ring gear 8 drives the left intermediate shaft 9 and the right intermediate shaft 10 to rotate, thereby realizing power diversion; specifically, the engine drives the first shaft 3 to rotate, the first shaft 3 drives the reverse gear sun gear 301 to rotate, the reverse gear sun gear 301 meshes with the reverse gear planetary gear 7, the reverse gear planetary gear 7 then meshes with the inner teeth 801 of the reverse gear planetary ring gear 8, the outer teeth 802 of the reverse gear planetary ring gear 8 mesh with the left reverse gear reduction gear 901 and the right reverse gear reduction gear 1001, thereby transmitting power to the left intermediate shaft 9 and the right intermediate shaft 10.

[0057] In one embodiment, the front auxiliary box gear sleeve 14 is in a neutral position and is not connected to the front auxiliary box high gear input gear 11 and the front auxiliary box low gear and third gear gear 15, so as to achieve a non-power transmission state, which is convenient for shifting operation; specifically, the front auxiliary box gear sleeve 14 is in a neutral position, which means that it is not connected to other gears. This state makes the transmission in a neutral state, without applying force to any gear, and includes the following advantages:

[0058] Avoid unnecessary friction: The neutral position prevents unnecessary gear engagement, thereby avoiding friction or heat inside the transmission, which can protect the life of the transmission;

[0059] Enables smooth gear shifting: When the transmission is in neutral, the driver can more easily shift into different gears (including reverse) without encountering resistance, ensuring smoother gear shifting;

[0060] Support reverse gear function: When reverse gear is needed, the neutral position design makes it easier to activate the reverse gear function, allowing the transmission to enter reverse state quickly and smoothly.

[0061] In one embodiment, the shift mechanism includes a first gear shift sleeve 25, a second and third gear shift sleeve 18 and a shift sleeve 35 on a rear auxiliary box synchronizer gear seat 34, which are used to select different gears to achieve different reduction ratios.

[0062] In one embodiment, the first gear 22 is connected to the second shaft 26 through the shift sleeve 25, the second gear 19 is connected to the second shaft 26 through the shift sleeve 18, and the front auxiliary box low gear and third gear 15 are connected to the second shaft 26 through the second and third gear shift sleeves 18.

[0063] In one embodiment, the second shaft 26 is an output shaft, and the second shaft 26 is connected to the sun gear 28 through a connecting sleeve 27, and the sun gear 28 drives the planetary gear system to output power to the output end of the transmission.

[0064] In one embodiment, the reverse gear implementation principle of the present application is as follows:

[0065] When the engine drives the first shaft 3 to rotate, the reverse gear sun gear 301 rotates accordingly, and transmits power to the reverse gear planetary ring gear 8 through the reverse gear planetary gear 7;

[0066] Since the reverse gear planet carrier 6 is fixed, the rotation direction of the reverse gear planetary ring gear 8 is opposite to the rotation direction of the first shaft 3, thereby realizing reverse power output to the left intermediate shaft 9 and the right intermediate shaft 10;

[0067] The gears on the left intermediate shaft 9 and the right intermediate shaft 10 rotate with the shaft, driving the other gears to rotate and output power;

[0068] Specifically, the above reverse gear implementation principle works as follows:

[0069] Realize the reversing function: The basic principle of reversing is that the wheels of the vehicle rotate in the opposite direction to that of normal driving. By using the reverse gear mentioned above to achieve this opposite rotation in the principle, the vehicle can move backwards and realize the reversing function;

[0070] Providing different speed ratios: The direction of rotation of the reverse gear planetary ring gear 8 is opposite to that of the first shaft 3, so that the transmission can provide different speed ratios to adapt to different reversing requirements (such as heavy load, low speed, etc.);

[0071] High flexibility: The reverse gear implementation principle allows the transmission to output at different speeds and torques when reversing, making the vehicle more flexible and efficient in various working conditions (such as climbing a slope or reversing in a narrow space);

[0072] Good stability: In the above reverse gear realization principle, the rotation direction of the reverse gear planetary ring gear 8 is opposite to the rotation direction of the first shaft 3, and the reverse gear planetary carrier 6 is fixed, which helps to reduce the impact during gear shifting, ensures that the vehicle is more stable when reversing, and improves driving safety and comfort.

[0073] Continuous Shifting: When reversing, the reverse rotation of the ring gear allows smoother shifting between gears, without having to stop the vehicle completely. This design improves the vehicle's operational flexibility during reversing, allowing the driver to quickly respond to changing conditions.

[0074] In one embodiment, the gear shift of the present application is as follows:

[0075] The first gear shifting sleeve 25 is used to connect or disconnect the first gear 22, the first gear 23 of the left intermediate shaft and the second shaft 26 to achieve the first gear shift;

[0076] The second and third gear shifting gear sleeve 18 is used to connect or disconnect the second gear 19, the left intermediate shaft second gear 20, the right intermediate shaft second gear 21 or the front auxiliary box low gear and third gear 15 with the second shaft 26 to achieve the switching between the second gear and the third gear;

[0077] The rear auxiliary box shift gear sleeve 35 is used to mesh with the low-speed synchronous cone 37 or the high-speed synchronous cone 36 to achieve the reduced speed output or direct output of the rear auxiliary box planetary gear train.

[0078] Please refer to Figure 2- Figure 7 In one embodiment, the reverse gear method of the present application is as follows:

[0079] Reverse gear preparation: put the front auxiliary gear sleeve 14 in the neutral position to ensure that the transmission remains stable when power is not required to be transmitted and to facilitate subsequent gear shifting;

[0080] Slow reverse: When slow reverse is required, the rear auxiliary gearbox shift gear sleeve 35 meshes with the low gear synchro cone 37 to achieve the deceleration output of the rear auxiliary gearbox planetary gear train; at the same time, the main gearbox first gear shift gear sleeve 25 meshes with the first gear gear 22 through the spline, and the second and third gear shift gear sleeves 18 are in the neutral position. At this time, the transmission outputs the first reverse gear, and the reduction ratio is the largest;

[0081] Continuously changing gears for reverse driving: The gears are adjusted by the shift mechanism to achieve reverse output of the second gear, the third gear and higher gears; specifically, the first gear shift gear sleeve 25 returns to neutral, and the second and third gear shift gear sleeves 18 mesh with the second gear gear 19 to achieve reverse second gear output;

[0082] Continue to increase the reverse speed: the second and third gear shift gear sleeve 18 is meshed with the front auxiliary box low gear and the third gear gear 15 to achieve the reverse third gear output; as the gear position is increased, the reverse gear ratio gradually decreases, and the reverse speed increases accordingly; specifically, at this time, the transmission outputs the reverse third gear, and the reduction ratio is less than the reverse second gear;

[0083] High-speed reverse: When high-speed reverse speed is required, the rear auxiliary gear case synchronous gear sleeve 35 meshes with the high-speed synchronous cone 36, and the planetary gear train directly outputs. The main gear case repeats the above shifting process, and can output reverse fourth gear, reverse fifth gear and reverse sixth gear to achieve high-speed reverse.

[0084] The present application forms a shift mechanism through the first gear shift gear sleeve 25, the second and third gear shift gear sleeve 18 and the shift gear sleeve 35 on the rear auxiliary box synchronizer gear seat 34, thereby realizing continuous gear change. The driver can smoothly switch from one gear to another during the reversing process without interrupting the reversing action, thereby improving the convenience and efficiency of the operation.

[0085] By adjusting the gear position, the present application can achieve a variety of reversing speeds from slow to high. When delicate operation is required or space is limited, a low gear (such as reverse first gear) can be selected for slow reversing; when fast reversing or long-distance reversing is required, a high gear (such as reverse fourth gear, reverse fifth gear or reverse sixth gear) can be switched to ensure a smooth and safe reversing process.

[0086] The present application utilizes the reverse gear sun gear 301 as the power input end, transmits the power to the reverse gear planetary ring gear 8 through the reverse gear planetary gear 7, and then drives the gears on the left intermediate shaft 9 and the right intermediate shaft 10 to rotate, which not only reduces the power loss, but also improves the transmission efficiency, making the reversing process smoother.

[0087] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0088] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. A transmission reverse gear system, used to achieve reverse at different vehicle speeds, It is characterized in that include: A front housing, used for fixing and installing the transmission; Input shaft, used to transmit engine power; A planetary gear mechanism including a planet carrier, a sun gear and planet gears, wherein the planet carrier is fixed to restrict its rotation; A reduction mechanism connected to the planetary gear mechanism and used to drive the output shaft of the transmission; A gear shift mechanism, used to select different gears to achieve different reduction ratios; and Output shaft, used to output the power after speed change; Among them, when the planet carrier is fixed, the planetary gear mechanism can rotate in the opposite direction to the input shaft, thereby achieving reverse power output.

2. The transmission reverse gear system according to claim 1, It is characterized in that The planetary gear mechanism also includes a reverse gear planetary gear ring, which has an internal and external tooth structure, wherein the internal teeth are used to cooperate with the reverse gear planetary wheel, and the external teeth are used to connect with the reduction mechanism.

3. The transmission reverse gear system according to claim 2, It is characterized in that The invention also comprises a transition structure, which is arranged between the reverse gear planetary ring gear in the planetary gear mechanism and the engaging structure on the front housing to achieve connection.

4. The transmission reverse gear system according to claim 1, It is characterized in that The shift mechanism includes a plurality of shift sleeves, which are meshed with gears in a planetary gear mechanism or a reduction mechanism to achieve different gear selections.

5. The transmission reverse gear system according to claim 4, It is characterized in that The planetary gear mechanism and the shift mechanism are used to realize reverse gear and are located at the front end of the front auxiliary box of the transmission and are directly connected to the front housing of the transmission.

6. The transmission reverse gear system according to claim 4, It is characterized in that When the transmission is in reverse gear, the shift sleeve moves in a preset direction, driving the reverse sun gear to rotate. The reverse planetary gear, while rotating on its own, interacts with the reverse planetary gear ring, driving the gear ring to rotate in the opposite direction of the reverse sun gear, thereby achieving reverse rotation of the transmission output shaft.

7. The transmission reverse gear system according to claim 6, It is characterized in that When the transmission is in reverse gear, the front auxiliary box synchronizer is in neutral to avoid load on the planetary gear mechanism.

8. A transmission reverse gear method, It is characterized in that The invention comprises a vehicle body and a transmission reverse gear system as claimed in any one of claims 1 to 7, and the vehicle body is reversed by utilizing the power output by the transmission reverse gear system.

9. The transmission reverse gear method according to claim 8, It is characterized in that The transmission reverse gear method is as follows: Put the synchronizer sleeve of the front auxiliary box in the neutral position; According to the required reverse speed, the gear combination is selected through the gear shift mechanism; Reverse rotation and reduction ratio adjustment are achieved through planetary gear mechanisms and reduction mechanisms; Output the shifted power for reversing.

10. The transmission reverse gear method according to claim 9, It is characterized in that During the reverse gear process, the transmission reverse gear system selects and connects different gear combinations through the shift mechanism to achieve different reverse gear ratios and obtain different reverse speeds.

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