Gearbox micro-crawling transmission mechanism

Abstract

The utility model discloses a gearbox micro -climbing drive mechanism relates to power transmission component technical field, install on the box of gearbox, including parallelly arranged auxiliary transmission shaft and power output shaft, the micro -climbing drive pipe is rotatably installed on the auxiliary transmission shaft, one end of micro -climbing drive pipe is fixed with micro -climbing planet carrier, and the micro -climbing planet carrier is rotatably installed with micro -climbing planet wheel, and the auxiliary transmission shaft is fixed with micro -climbing sun gear that is always engaged with micro -climbing planet wheel, and the box is fixed with micro -climbing external gear ring that is always engaged with micro -climbing planet wheel, and the micro -climbing drive pipe with micro -climbing drive assembly is established between power output shaft. The utility model discloses compact structure and realizes big transmission ratio, and it is favorable to realize super -low -speed output.

Description

Technical Field

[0001] This utility model relates to the field of power transmission components technology, and in particular to a gearbox micro-climbing transmission mechanism. Background Technology

[0002] Tractors are currently the mainstream power equipment in agricultural machinery, providing traction and power output to other machinery during field operations. To adapt to different application scenarios, tractors are equipped with gearboxes that switch between gears to achieve the required traction speed. For example, during normal field relocation, the gearbox is switched to a high gear, allowing the engine to drive the tractor at high speeds, improving relocation efficiency. Conversely, during deep plowing, sowing, and other field operations, the gearbox is switched to a low gear, allowing the tractor to travel at low speeds to meet operational speed requirements. In deep plowing, for instance, operating speeds can drop to below 0.5 km / h, necessitating a micro-climbing capability in such ultra-low-speed operations. Currently, tractor gearboxes primarily increase the traction ratio by increasing the main transmission gear ratio and adding auxiliary transmission mechanisms to achieve this micro-climbing capability. However, this method increases the gearbox size, leading to a larger front-to-rear wheelbase and / or smaller ground clearance, which is detrimental to smooth field operations, especially in confined spaces. Therefore, the micro-climbing function structure needs to be improved to address the aforementioned issues, taking into account the size limitations of the gearbox. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide a gearbox micro-climbing transmission mechanism with a compact structure and a large transmission ratio, which is conducive to achieving ultra-low speed output.

[0004] To solve the above-mentioned technical problems, the technical solution of this utility model is: a micro-crawling transmission mechanism for a gearbox, installed on the gearbox housing, including a secondary transmission shaft and a power output shaft arranged in parallel, a micro-crawling transmission tube rotatably mounted on the secondary transmission shaft; a micro-crawling planetary carrier is fixedly provided at one end of the micro-crawling transmission tube, a micro-crawling planetary gear is rotatably mounted on the micro-crawling planetary carrier, a micro-crawling sun gear that is constantly meshed with the micro-crawling planetary gear is fixedly provided on the secondary transmission shaft, a micro-crawling external gear ring that is constantly meshed with the micro-crawling planetary gear is fixedly provided on the housing; a micro-crawling transmission assembly is provided between the micro-crawling transmission tube and the power output shaft.

[0005] As a preferred technical solution, the micro-climbing transmission assembly includes a micro-climbing drive wheel fixedly mounted on the micro-climbing transmission tube, a micro-climbing driven wheel rotatably mounted on the power output shaft and constantly meshing with the micro-climbing drive wheel, and a micro-climbing synchronizer provided between the micro-climbing driven wheel and the power output shaft.

[0006] As a preferred technical solution, an auxiliary transmission assembly is further provided between the auxiliary transmission shaft and the power output shaft.

[0007] As a preferred technical solution, the auxiliary transmission assembly includes an auxiliary transmission drive wheel mounted on the auxiliary transmission shaft, an auxiliary transmission driven wheel that is constantly meshed with the auxiliary transmission drive wheel mounted on the power output shaft, and an auxiliary transmission synchronizer installed between the auxiliary transmission drive wheel and the auxiliary transmission shaft or between the auxiliary transmission driven wheel and the power output shaft.

[0008] Due to the adoption of the above technical solution, the gearbox micro-crawler transmission mechanism, installed on the gearbox housing, includes a secondary transmission shaft and a power output shaft arranged in parallel. A micro-crawler transmission tube is rotatably mounted on the secondary transmission shaft. A micro-crawler planetary carrier is fixedly provided at one end of the micro-crawler transmission tube, and micro-crawler planetary gears are rotatably mounted on the micro-crawler planetary carrier. A micro-crawler sun gear that is constantly meshed with the micro-crawler planetary gears is fixedly provided on the secondary transmission shaft. A micro-crawler external gear ring that is constantly meshed with the micro-crawler planetary gears is fixedly provided on the housing. A micro-crawler transmission assembly is provided between the micro-crawler transmission tube and the power output shaft. The micro-climbing sun gear, micro-climbing planetary gears, and micro-climbing external gear ring of this invention constitute a planetary reduction mechanism. By rotatably mounting a micro-climbing transmission tube on the secondary transmission shaft, the planetary reduction path is routed around the secondary transmission shaft. The structure is compact and does not affect the vertical width of the gearbox, thus not affecting the tractor's ground clearance. Furthermore, the planetary reduction mechanism is positioned above the output end of the power output shaft, that is, above the original differential and other structures at the output end of the power output shaft, without affecting the position of the original differential and other structures. Therefore, it does not increase the front-to-rear length of the gearbox and does not affect the original front-to-rear track of the tractor. After passing through the micro-climbing transmission assembly, a large transmission ratio can be formed between the secondary transmission shaft and the power output shaft, which is beneficial for achieving ultra-low speed output. Attached Figure Description

[0009] The following figures are intended only to illustrate and explain the present invention and do not limit the scope of the present invention. Wherein: Figure 1 This is a structural schematic diagram of an embodiment of the present utility model.

[0010] In the diagram: 1-Main transmission section; 2-Secondary transmission shaft; 3-Power output shaft; 4-Secondary transmission assembly; 41-Secondary transmission drive wheel; 42-Secondary transmission driven wheel; 43-Secondary transmission synchronizer; 5-Micro-crawler transmission tube; 51-Micro-crawler planetary carrier; 52-Micro-crawler planetary gears; 53-Micro-crawler sun gear; 54-Micro-crawler external gear ring; 6-Micro-crawler transmission assembly; 61-Micro-crawler drive wheel; 62-Micro-crawler driven wheel; 63-Micro-crawler synchronizer. Detailed Implementation

[0011] The present invention will be further described below with reference to the accompanying drawings and embodiments. In the following detailed description, only certain exemplary embodiments of the present invention are described by way of illustration. Undoubtedly, those skilled in the art will recognize that various modifications can be made to the described embodiments without departing from the spirit and scope of the present invention. Therefore, the drawings and description are illustrative in nature and not intended to limit the scope of the claims.

[0012] like Figure 1 As shown, the gearbox micro-crawler transmission mechanism is installed on the gearbox housing and includes a secondary transmission shaft 2 and a power output shaft 3 arranged in parallel. A micro-crawler transmission tube 5 is rotatably mounted on the secondary transmission shaft 2. A micro-crawler planetary carrier 51 is fixedly provided at one end of the micro-crawler transmission tube 5, and a micro-crawler planetary gear 52 is rotatably mounted on the micro-crawler planetary carrier 51. A micro-crawler sun gear 53 that is constantly meshed with the micro-crawler planetary gear 52 is fixedly provided on the secondary transmission shaft 2. A micro-crawler external gear ring 54 that is constantly meshed with the micro-crawler planetary gear 52 is fixedly provided on the housing. A micro-crawler transmission assembly 6 is provided between the micro-crawler transmission tube 5 and the power output shaft 3.

[0013] In this embodiment, the micro-climbing sun gear 53, micro-climbing planetary gears 52, and micro-climbing external gear ring 54 constitute a planetary reduction mechanism. By rotatably mounting the micro-climbing transmission tube 5 on the secondary transmission shaft 2, the planetary reduction path is routed around the secondary transmission shaft 2. The structure is compact and does not affect the vertical width of the gearbox, thus not affecting the tractor's ground clearance. Furthermore, the planetary reduction mechanism is positioned above the output end of the power output shaft 3, that is, above the original differential and other structures at the output end of the power output shaft 3, without affecting the position of the original differential and other structures. Therefore, it does not increase the front-to-rear length of the gearbox and does not affect the original front-to-rear track of the tractor. After passing through the micro-climbing transmission assembly 6, a large transmission ratio can be formed between the secondary transmission shaft 2 and the power output shaft 3, which is beneficial for achieving ultra-low speed output.

[0014] The micro-climbing transmission tube 5 is rotatably mounted on the secondary transmission shaft 2 using a bearing, more preferably, in this embodiment, a needle roller bearing. Rotational mounting using a bearing significantly reduces the impact of vibrations in the planetary reduction gear during transmission on the transmission from the secondary transmission shaft 2 to the power output shaft 3, promoting smooth transmission. The micro-climbing sun gear 53 is fixed to the secondary transmission shaft 2 in a circumferentially fixed manner. Based on the installation requirements of the micro-climbing transmission tube 5, the micro-climbing sun gear 53 is preferably connected to the secondary transmission shaft 2 via a key connection to form a circumferentially fixed arrangement, and more preferably, a spline connection is used.

[0015] The micro-crawling transmission assembly 6 described in this embodiment includes a micro-crawling drive wheel 61 fixedly mounted on the micro-crawling transmission tube 5. A micro-crawling driven wheel 62, which is constantly meshed with the micro-crawling drive wheel 61, is rotatably mounted on the power output shaft 3. A micro-crawling synchronizer 63 is provided between the micro-crawling driven wheel 62 and the power output shaft 3. Conventionally, the micro-crawling synchronizer 63 includes a synchronization sleeve splinedly connected to the power output shaft 3. The micro-crawling driven wheel 62 has an external spline that can engage with the internal spline of the synchronization sleeve. When the synchronization sleeve is moved toward the micro-crawling driven wheel 62, its external spline engages with the internal spline of the micro-crawling driven wheel 62, allowing the power of the gear transmission to be transmitted to the power output shaft 3. The structural principle of the synchronizer is easily understood using conventional techniques in the art and will not be elaborated further here.

[0016] Of course, the micro-climbing transmission assembly 6 described in this embodiment is not limited to the above structural form. For example, the micro-climbing drive wheel 61 can be rotatably mounted on the auxiliary transmission shaft 2, the micro-climbing driven wheel 62 can be fixedly mounted on the power output shaft 3, and a micro-climbing synchronizer 63 can be provided between the micro-climbing drive wheel 61 and the micro-climbing transmission pipe 5, which can also achieve the same technical effect. These variations are also within the protection scope of the micro-climbing transmission assembly 6. Preferably, the transmission ratio between the micro-climbing drive wheel 61 and the micro-climbing driven wheel 62 is greater than 1 to further improve the micro-climbing transmission ratio.

[0017] Conventionally, a secondary transmission assembly 4 is also provided between the secondary transmission shaft 2 and the power output shaft 3 to cooperate with the main transmission part 1 to achieve conventional low-speed transmission. In this embodiment, the secondary transmission assembly 4 includes a secondary transmission drive wheel 41 mounted on the secondary transmission shaft 2, and a secondary transmission driven wheel 42 that is constantly meshed with the secondary transmission drive wheel 41 mounted on the power output shaft 3. A secondary transmission synchronizer 43 is installed between the secondary transmission drive wheel 41 and the secondary transmission shaft 2, or between the secondary transmission driven wheel 42 and the power output shaft 3. That is, in this embodiment, there is an additional set of secondary transmission assemblies 4 between the secondary transmission shaft 2 and the power output shaft 3, in addition to the micro-climbing section. Of course, it is also possible to provide two or more sets of secondary transmission assemblies 4. The structural principle of the transmission assembly where gears are constantly meshed and power is connected through a synchronizer is the same as that of the aforementioned micro-climbing transmission assembly 6, and is easily understood using conventional techniques in the field, so it will not be elaborated further here. In this embodiment, the auxiliary transmission synchronizer 43 is only shown to be located between the auxiliary transmission drive wheel 41 and the auxiliary transmission drive shaft 2. At this time, the auxiliary transmission drive wheel 41 is rotatably mounted on the auxiliary transmission drive shaft 2, and the auxiliary transmission driven wheel 42 is circumferentially fixed at least on the power output shaft 3.

[0018] Preferably, in this embodiment, the secondary transmission driven wheel 42 is circumferentially fixed and axially slidably connected to the power output shaft 3. This connection can be achieved through a key connection, and preferably, a spline connection is used. The micro-crawler driven wheel 62 is provided with an external spline that engages with the internal spline on the secondary transmission driven wheel 42. Thus, the secondary transmission driven wheel 42 also serves as the synchronization sleeve structure in the micro-crawler synchronizer 63. Under this structure, during normal secondary transmission transmission, the secondary transmission synchronizer 43 connects the secondary transmission driving wheel 41 and the secondary transmission shaft 2. When micro-crawler transmission is required, the secondary transmission driven wheel 42 slides towards the micro-crawler driven wheel 62, and the external spline on the secondary transmission driven wheel 42 engages with the internal spline on the micro-crawler driven wheel 62, forming a power connection between the micro-crawler driven wheel 62 and the power output shaft 3. Therefore, this embodiment achieves the effect of increasing the micro-gear ratio by means of the dual-function design of the secondary transmission driven wheel 42 without changing the original arrangement space of the secondary transmission part, while still having the secondary transmission.

[0019] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A gearbox micro-crawling transmission mechanism, mounted on the gearbox housing, comprising a parallel-arranged auxiliary transmission shaft and a power output shaft, characterized in that: A micro-crawler transmission tube is rotatably mounted on the auxiliary transmission shaft; a micro-crawler planetary carrier is fixedly mounted at one end of the micro-crawler transmission tube, a micro-crawler planetary gear is rotatably mounted on the micro-crawler planetary carrier, a micro-crawler sun gear that is constantly meshed with the micro-crawler planetary gear is fixedly mounted on the auxiliary transmission shaft, and a micro-crawler external gear ring that is constantly meshed with the micro-crawler planetary gear is fixedly mounted on the housing; a micro-crawler transmission assembly is provided between the micro-crawler transmission tube and the power output shaft.

2. The gearbox micro-creep transmission mechanism as described in claim 1, characterized in that: The micro-climbing transmission assembly includes a micro-climbing drive wheel fixedly mounted on the micro-climbing transmission tube, a micro-climbing driven wheel rotatably mounted on the power output shaft and constantly meshing with the micro-climbing drive wheel, and a micro-climbing synchronizer provided between the micro-climbing driven wheel and the power output shaft.

3. The gearbox micro-creep transmission mechanism as described in claim 1, characterized in that: A secondary transmission assembly is also provided between the secondary transmission shaft and the power output shaft.

4. The gearbox micro-creep transmission mechanism as described in claim 3, characterized in that: The auxiliary transmission assembly includes an auxiliary drive wheel mounted on the auxiliary transmission shaft, an auxiliary driven wheel that is constantly meshed with the auxiliary drive wheel mounted on the power output shaft, and an auxiliary synchronizer installed between the auxiliary drive wheel and the auxiliary transmission shaft or between the auxiliary driven wheel and the power output shaft.

Images