Gearbox speed change structure suitable for various working conditions

Abstract

The utility model discloses a gearbox speed change structure suitable for various working conditions, and belongs to the field of gearboxes. Comprising a main speed change module which is provided with an HST and an auxiliary speed change module; the auxiliary speed change module is arranged on the main speed change module; a power transmission mechanism and a gear shifting mechanism are arranged in the auxiliary speed change module; according to the power transmission mechanism, a first-gear driving gear, a second-gear driving gear and a third-gear driving gear are arranged on an input shaft in a non-rotating mode; a reverse gear is rotatably arranged on the reverse transition shaft; the output shaft is provided with a gear meshing lining and a meshing tooth holder. A first-gear driven gear, a second-gear driven gear, a third-gear driven gear and a reverse-gear driven gear used for being meshed with the reverse-gear gear are arranged on the gear meshing lining. And two meshing sleeves are arranged on the meshing tooth holder to control the output shaft to output different gear rotating speeds. The gearbox speed change structure has the beneficial effect that the gearbox speed change structure adapts to various working conditions.

Description

Technical Field

[0001] This application relates to the field of gearboxes, and more specifically, to a gearbox transmission structure adaptable to various operating conditions. Background Technology

[0002] Currently, agricultural machinery, such as tracked tractors, uses two types of transmission systems: one is a mechanical gear shifter, and the other is a hydraulic gear shifter. The advantage of the latter is that it can achieve stepless speed change, smooth speed change, and good stability. The problem is that it has high wear and low transmission efficiency.

[0003] The structure of the product can be referenced from an integral dual-HST planetary differential steering gearbox disclosed in Chinese Patent Document Publication No. CN111271427B, which includes a power output mechanism, a travel transmission mechanism, and a steering transmission mechanism. The travel transmission mechanism includes a travel HST, a shift shaft, a travel brake shaft, and a sun shaft. A hydraulic travel gear is mounted on the travel HST. The shift shaft is provided with a hydraulic gear, a mechanical driven gear, and a fast / slow gear drive gear that mesh with the hydraulic travel gear. First and second shift sleeves are mounted on the shift shaft. A travel input gear and a fast / slow gear driven gear that mesh with the fast / slow gear drive gear are fixed on the travel brake shaft. A travel driven gear is located in the middle of the sun shaft, and planetary differential mechanisms are correspondingly located on both sides of the sun shaft. The travel input gear drives the travel driven gear to rotate.

[0004] The aforementioned structure incorporates both a hydraulic continuously variable transmission (CVT) and a mechanical transmission in its travel drive mechanism. However, the hydraulic CVT suffers from high power loss and is suitable for general operations due to its ease of operation; the mechanical transmission offers high efficiency and is ideal for heavy-load traction operations. Furthermore, the mechanical transmission, with only one gear, cannot meet the demands of actual traction conditions due to space constraints.

[0005] Therefore, a gearbox transmission structure that can adapt to various operating conditions is needed. Utility Model Content

[0006] The summary section of this application is intended to provide a brief overview of the concepts, which will be described in detail in the detailed description section below. This summary section is not intended to identify key or essential features of the claimed technical solutions, nor is it intended to limit the scope of the claimed technical solutions.

[0007] To address the technical problems mentioned in the background section, some embodiments of this application provide a gearbox transmission structure adaptable to various operating conditions, comprising: a main transmission module, which has an HST and a secondary transmission module installed thereon, and a power output mechanism connecting the HST and the secondary transmission module within the main transmission module; a secondary transmission module, installed on the main transmission module, used to adjust the output travel power of the main transmission module; the secondary transmission module includes: a power transmission mechanism and a shifting mechanism; the power transmission mechanism includes: an input shaft, on which a first-gear drive gear, a second-gear drive gear, and a third-gear drive gear are non-rotatably mounted; a reverse gear transition shaft, on which a reverse gear is rotatably mounted; and an output shaft, on which a gear engagement bushing and a gear seat are non-rotatably mounted; the gear engagement bushing is rotatably mounted with a first-gear driven gear for engaging with the first-gear drive gear, a second-gear driven gear for engaging with the second-gear drive gear, a third-gear driven gear for engaging with the third-gear drive gear, and a reverse gear driven gear for engaging with the reverse gear. Two meshing sleeves are slidably provided on the meshing gear seat, respectively located between the second-gear driven gear and the third-gear driven gear and between the first-gear driven gear and the reverse-gear driven gear, to control the output shaft to output different gear speeds.

[0008] By setting up first-gear driven gears, second-gear driven gears, and third-gear driven gears respectively, power can be output according to the required gear. Simultaneously, by setting up a reverse-gear driven gear that meshes with the reverse gear, reverse power output is achieved. The designed meshing gear seats and meshing sleeves facilitate switching between different gears.

[0009] Furthermore, the shifting mechanism includes: a shift fork shaft and a gear lever support; the shift fork shaft is slidably provided with a second-to-third gear shift fork for driving the meshing sleeve between the second and third gear driven gears, and a first-to-reverse gear shift fork for driving the meshing sleeve between the first and reverse gear driven gears; one end of the gear lever is inserted into the auxiliary transmission module to drive the first-to-reverse gear shift fork and the second-to-third gear shift fork.

[0010] The reverse gear shift fork and the first gear shift fork allow for easy switching between second and third gears, as well as first and reverse gears.

[0011] Furthermore, a gearbox cover is provided on the auxiliary gearbox module, a gear lever support is fixed on the gearbox cover, and a gear lever dust cover is provided on the gear lever support.

[0012] The dust cover on the gear lever prevents dust from affecting the operation of the gearbox.

[0013] Furthermore, the gear shift lever support is provided with a nylon pressure seat, the gear shift lever is fitted with a gear shift lever spring, and a gear shift lever spring retainer ring is provided on the gear shift lever that abuts against one end of the gear shift lever spring, while the other end of the gear shift lever spring abuts against the gear shift lever support.

[0014] The gear lever spring is designed to facilitate the return of the gear lever when shifting to neutral.

[0015] Furthermore, a gear shift guide plate is fixed on the gearbox cover to guide the gear shifting action of the gear lever.

[0016] The gear shift guide plate is designed to accurately guide the gear shift lever during gear shifting.

[0017] Furthermore, the power output mechanism of the main transmission module includes: a transmission shaft disposed within the main transmission module and connected to the power source for transmission; one end of the transmission shaft is connected to the input shaft of the auxiliary transmission module, and the other end is connected to the input shaft of the travel HST.

[0018] By sending power output to the secondary transmission module and HST, gear shifting is facilitated, and the secondary transmission module and HST can be interchanged to switch between different operating conditions.

[0019] Furthermore, the main transmission module is also equipped with a travel transmission mechanism, which includes: a shift shaft, installed in the main transmission module; a brake shaft, installed in the main transmission module and connected to the shift shaft for transmission; a fast gear driven gear, an intermediate gear driven gear, and a slow gear driven gear are installed on the brake shaft; and a first transmission wheel, a second transmission wheel, and a third transmission wheel are provided on the shift shaft for respectively meshing and transmitting power to the fast gear driven gear, the intermediate gear driven gear, and the slow gear driven gear.

[0020] By setting up fast gear driven gear, intermediate gear driven gear, and slow gear driven gear, the continuity of gear shifting is improved.

[0021] Furthermore, a shift sleeve is provided between the second and third transmission wheels and on the first transmission wheel.

[0022] The beneficial effect of this application is that it provides a gearbox transmission structure that can adapt to various working conditions. Attached Figure Description

[0023] The accompanying drawings, which form part of this application, are used to provide a further understanding of the application and to make other features, objects, and advantages of the application more apparent. The illustrative embodiments and descriptions of this application are used to explain the application and do not constitute an undue limitation of the application.

[0024] Furthermore, throughout the accompanying drawings, the same or similar reference numerals denote the same or similar elements. It should be understood that the drawings are schematic, and the elements are not necessarily drawn to scale.

[0025] In the attached diagram:

[0026] Figure 1This is an overall schematic diagram of the installation of the auxiliary transmission module and HST according to one embodiment of this application;

[0027] Figure 2 yes Figure 1 A schematic diagram of the internal structure of the secondary transmission module in the embodiment;

[0028] Figure 3 yes Figure 1 The internal structure diagram of the main transmission module and the auxiliary transmission module in the embodiment is shown below.

[0029] Figure 4 yes Figure 1 Internal structure diagram of the secondary transmission module in the embodiment;

[0030] Figure 5 yes Figure 1 The installation structure diagram of the gearbox cover in the embodiment is shown.

[0031] Figure label:

[0032] 100. Main transmission module; 101. Auxiliary transmission module; 102. Input shaft; 103. First gear drive gear; 104. Second gear drive gear; 105. Third gear drive gear; 106. Reverse gear transition shaft; 107. Reverse gear; 108. Output shaft; 109. First gear driven gear; 110. Second gear driven gear; 111. Second gear driven gear; 112. Reverse gear driven gear; 113. Gear engagement bushing; 114. Engagement gear seat; 115. Engagement sleeve; 116. Gear shift fork shaft; 117. Gear lever; 18. Second to third gear shift fork; 119. First to reverse gear shift fork; 120. Gearbox cover; 121. Gear lever support; 122. Gear lever dust cover; 123. Nylon pressure seat; 124. Gear lever spring; 125. Gear lever spring retainer ring; 126. Gear shift guide plate; 127. Drive shaft; 128. Shift shaft; 129. Brake shaft; 130. Fast gear driven gear; 131. Intermediate gear driven gear; 132. Slow gear driven gear; 133. First drive wheel; 134. Second drive wheel; 135. Third drive wheel. Detailed Implementation

[0033] Embodiments of this disclosure will now be described in more detail with reference to the accompanying drawings. While some embodiments of this disclosure are shown in the drawings, it should be understood that this disclosure can be implemented in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of this disclosure. It should be understood that the accompanying drawings and embodiments of this disclosure are for illustrative purposes only and are not intended to limit the scope of protection of this disclosure.

[0034] It should also be noted that, for ease of description, only the parts relevant to the invention are shown in the accompanying drawings. Unless otherwise specified, the embodiments and features described in this disclosure can be combined with each other.

[0035] It should be noted that the concepts of "first" and "second" mentioned in this disclosure are used only to distinguish different devices, modules or units, and are not used to limit the order of functions performed by these devices, modules or units or their interdependencies.

[0036] It should be noted that the terms "a" and "a plurality of" used in this disclosure are illustrative rather than restrictive, and those skilled in the art should understand that, unless otherwise expressly indicated in the context, they should be understood as "one or more".

[0037] This disclosure will now be described in detail with reference to the accompanying drawings and embodiments.

[0038] Reference Figure 1-5 A gearbox transmission structure adaptable to various working conditions includes: a main transmission module 100, an HST (Hydraulic Transmission System), and a secondary transmission module 101. An HST and a secondary transmission module 101, which can be replaced by the HST, are detachably mounted on the main transmission module 100. The main transmission module 100 contains a power output mechanism that connects to the HST or the secondary transmission module 101. The secondary transmission module 101, mounted on the main transmission module 100, is used to adjust the output travel power of the main transmission module 100.

[0039] The auxiliary transmission module 101 rotatably houses: an input shaft 102, a reverse gear transition shaft 106, and an output shaft 108. The input shaft 102 is non-rotatably equipped with a first-gear drive gear 103, a second-gear drive gear 104, and a third-gear drive gear 105. The reverse gear transition shaft 106 is rotatably equipped with a reverse gear 107. The output shaft 108 is non-rotatably equipped with a gear engagement bushing 113 and a gear seat 114. The gear engagement bushing 113 is rotatably equipped with a first-gear driven gear 109 for meshing with the first-gear drive gear 103, a second-gear driven gear 110 for meshing with the second-gear drive gear 104, a third-gear driven gear 111 for meshing with the third-gear drive gear 105, and a reverse gear driven gear 112 for meshing with the reverse gear 107. The meshing gear seat 114 is slidably provided with two meshing sleeves 115, which are respectively located between the second-gear driven gear 110 and the third-gear driven gear 111 and between the first-gear driven gear 109 and the reverse-gear driven gear 112. The meshing sleeves 115 can be slidably engaged with one of the second-gear driven gear 110 or the third-gear driven gear 111, the first-gear driven gear 109 or the reverse-gear driven gear 112, thereby controlling the output shaft 108 to output different gear speeds.

[0040] In one embodiment, the engagement sleeve 115 engages with the first gear driven gear 109, causing the output shaft 108 to rotate synchronously with the first gear driven gear 109. At this time, the engagement sleeve 115 does not engage with the second gear driven gear 110, the reverse gear driven gear 112, or the third gear driven gear 111.

[0041] In another embodiment, the engagement sleeve 115 engages with the second-gear driven gear 110, causing the output shaft 108 to rotate synchronously with the second-gear driven gear 110. At this time, the engagement sleeve 115 does not engage with the first-gear driven gear 109, the reverse gear driven gear 112, or the third-gear driven gear 111.

[0042] In another embodiment, the engagement sleeve 115 engages with the third gear driven gear 111, causing the output shaft 108 to rotate synchronously with the third gear driven gear 111. At this time, the engagement sleeve 115 does not engage with the second gear driven gear 110, the reverse gear driven gear 112, or the first gear driven gear 109.

[0043] In another embodiment, the engagement sleeve 115 engages with the reverse driven gear 112, causing the output shaft 108 to rotate synchronously with the reverse driven gear 112. At this time, the engagement sleeve 115 does not engage with the second driven gear 110, the third driven gear 111, or the first driven gear 109.

[0044] Power is output according to different gears by engaging the gear seat 114 and engaging the sleeve 115.

[0045] The auxiliary transmission module 101 is provided with a transmission cover 120, and a gear lever support 121 is fixed on the transmission cover 120. The gear lever support 121 is provided with a gear lever dust cover 122 and a gear lever 117.

[0046] In one embodiment, the gear shift lever support 121 is provided with a nylon pressure seat 123, the gear shift lever 117 is fitted with a gear shift lever spring 124, the gear shift lever 117 is provided with a gear lever spring retainer 125 that abuts against one end of the gear shift lever spring 124, and the other end of the gear shift lever spring 124 abuts against the gear shift lever support 121.

[0047] One end of the gear shift lever 117 is inserted into the auxiliary gear shift module 101 and a first-reverse shift fork 119 and a second-to-third shift fork 118 are installed.

[0048] The auxiliary transmission module 101 is equipped with a gear shift fork shaft 116. A first-reverse gear shift fork 119 and a second-to-third gear shift fork 118 are slidably mounted on the gear shift fork shaft 116. The first-reverse gear shift fork 119 is rotatably connected to a meshing sleeve 115 located between the first gear driven gear 109 and the reverse gear driven gear 112. The second-to-third gear shift fork 118 is rotatably connected to a meshing sleeve 115 located between the second gear driven gear 110 and the third gear driven gear 111.

[0049] A gear shift guide plate 126 is fixed on the gearbox cover 120 to guide the shifting action of the gear lever 117.

[0050] The main transmission module 100 is equipped with a drive shaft 127 for power source transmission connection.

[0051] In one embodiment, one end of the drive shaft 127 is connected to the input shaft 102, and the other end is connected to the input shaft of the travel HST.

[0052] The main transmission module 100 also includes a travel transmission mechanism, which comprises a shift shaft 128 and a brake shaft 129. The shift shaft 128 is rotatably mounted within the main transmission module and is connected to the output shaft 108 or the HST output shaft. The brake shaft 129 is rotatably mounted within the main transmission module and is drively connected to the shift shaft 128. A fast gear driven gear 130, an intermediate gear driven gear 131, and a slow gear driven gear 132 are fixedly mounted on the brake shaft 129. A first transmission wheel 133, a second transmission wheel 134, and a third transmission wheel 135 are rotatably mounted on the shift shaft 128 and mesh with the fast gear driven gear 130, the intermediate gear driven gear 131, and the slow gear driven gear 132, respectively.

[0053] A shift sleeve is provided on the shift shaft 128 through a non-rotatable sliding connection between the second transmission wheel 134 and the third transmission wheel 135, and on the first transmission wheel 133.

[0054] In one embodiment, the first transmission gear transmits power from the shift shaft 128 to the brake shaft 129 via the fast gear transmission gear;

[0055] In another embodiment, the second drive wheel 134 transmits power to the brake shaft 129 via the intermediate driven gear 131 and the shift shaft 128;

[0056] In another embodiment, the third drive wheel 135 transmits power to the brake shaft 129 via the slow-gear driven gear 132 and the shift shaft 128.

[0057] The above description is merely a selection of preferred embodiments of this disclosure and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of the invention involved in the embodiments of this disclosure is not limited to technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the above-described inventive concept. For example, technical solutions formed by substituting the above-described features with (but not limited to) technical features with similar functions disclosed in the embodiments of this disclosure.

Claims

1. A gearbox transmission structure adaptable to various operating conditions, comprising: The main transmission module is characterized by: The main transmission module is equipped with an HST and a secondary transmission module. The main transmission module contains a power output mechanism that connects the HST and the secondary transmission module. The auxiliary transmission module is installed on the main transmission module and is used to adjust the output travel power of the main transmission module. The auxiliary transmission module includes: Power transmission mechanism, gear shifting mechanism; The power transmission mechanism includes: The input shaft is equipped with a first-speed drive gear, a second-speed drive gear, and a third-speed drive gear that are not rotatably mounted on it. A reverse gear transition shaft is provided, on which a reverse gear is rotatably mounted; The output shaft is provided with a non-rotatable gear engagement bushing and engagement gear seat; The gear engagement bushing is rotatably provided with a first gear driven gear for engaging with the first gear drive gear, a second gear driven gear for engaging with the second gear drive gear, a third gear driven gear for engaging with the third gear drive gear, and a reverse gear driven gear for engaging with the reverse gear. Two meshing sleeves are slidably provided on the meshing gear seat, respectively located between the second-gear driven gear and the third-gear driven gear and between the first-gear driven gear and the reverse-gear driven gear, to control the output shaft to output different gear speeds.

2. The gearbox transmission structure adaptable to multiple working conditions according to claim 1, characterized in that: The gear shifting mechanism includes: gear shift fork shaft and gear lever; The gear shift fork shaft is slidably provided with a second-to-third gear shift fork for driving the meshing sleeve between the second-gear driven gear and the third-gear driven gear, and a first-to-reverse gear shift fork for driving the meshing sleeve between the first-gear driven gear and the reverse gear driven gear; One end of the gear lever is inserted into the auxiliary gear shift module to drive the first-reverse shift fork and the second-third shift fork.

3. The gearbox transmission structure adaptable to multiple working conditions according to claim 2, characterized in that: The auxiliary transmission module is equipped with a gearbox cover, the gear lever support is fixed on the gearbox cover, and the gear lever support is equipped with a gear lever dust cover.

4. The gearbox transmission structure adaptable to multiple working conditions according to claim 3, characterized in that: The gear shift lever support is equipped with a nylon pressure seat, the gear shift lever is fitted with a gear shift lever spring, and a gear shift lever spring retainer ring is provided on the gear shift lever that abuts against one end of the gear shift lever spring, while the other end of the gear shift lever spring abuts against the gear shift lever support.

5. The gearbox transmission structure adaptable to multiple working conditions according to claim 4, characterized in that: The gearbox cover is fixed with a gear shift guide plate to guide the gear shifting action of the gear lever.

6. The gearbox transmission structure adaptable to multiple working conditions according to claim 1, characterized in that: The power output mechanism of the main transmission module includes: a transmission shaft disposed in the main transmission module and connected to the power source for transmission; one end of the transmission shaft is connected to the input shaft of the auxiliary transmission module, and the other end is connected to the input shaft of the travel HST.

7. The gearbox transmission structure adaptable to multiple working conditions according to claim 6, characterized in that: The main transmission module is also equipped with a travel transmission mechanism, which includes: The shift shaft is installed inside the main transmission module; The brake shaft is installed inside the main transmission module and is connected to the shift shaft for transmission. The brake shaft is equipped with a fast gear driven gear, an intermediate gear driven gear, and a slow gear driven gear; The shift shaft is equipped with a first transmission wheel, a second transmission wheel, and a third transmission wheel that mesh with the fast gear driven gear, the intermediate gear driven gear, and the slow gear driven gear, respectively.

8. The gearbox transmission structure adaptable to multiple working conditions according to claim 7, characterized in that: A shift sleeve is provided between the second transmission wheel and the third transmission wheel, as well as on the first transmission wheel.

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