A bulldozer transmission system

Abstract

This invention provides a transmission system for a bulldozer, including an engine, a torque converter module, a transmission module, and a travel module. The engine is connected to the torque converter module, which is connected to the travel module via the transmission module. The torque converter module is housed within a torque converter housing and includes a torque converter drive shaft, a hydraulic transmission assembly, and a mechanical transmission assembly. One end of the torque converter drive shaft is connected to the transmission module. The engine is connected to one end of the torque converter drive shaft via the hydraulic transmission assembly, and the other end of the engine is connected to the other end of the torque converter drive shaft via the mechanical transmission assembly. The engine drives the hydraulic transmission assembly and the mechanical transmission assembly to synchronously output power to the torque converter drive shaft. By combining hydraulic and mechanical transmission, the adjustable efficiency range between the engine and the torque converter is increased, thus facilitating adaptation to bulldozers with different power ratings.

Description

Technical Field

[0001] This invention relates to the field of transmission system technology, and more specifically to a transmission system for a bulldozer. Background Technology

[0002] In existing high-power bulldozers, the vast majority employ mechanical-hydraulic transmission. The hydraulic torque converter mainly consists of a transfer case and a torque converter. Engine power first passes through the transfer case, which contains two sets of power take-off (PTOs). Part of the power is output from the PTO port to the pilot pump, transmission pump, and steering pump, enabling the machine to operate and steer. The other part of the power is output to the gearbox via the torque converter, enabling the machine to travel and traction. This structure adds a transfer case between the torque converter and the engine. When designing dimensional tolerances, the large number of components in the dimensional chain results in smaller tolerances allocated to each component, leading to machining difficulties and high manufacturing costs.

[0003] Existing technology, such as Chinese patent application number 201720828211.3, with an authorization announcement date of April 6, 2018, discloses a bulldozer hydraulic torque converter, relating to the field of engineering machinery. It includes a cover wheel, a turbine, a housing, a pump wheel, a guide wheel, bearings, a power take-off gear, and a transfer gear. One end of the cover wheel is equipped with a gear connected to the engine's ring gear, and the other end is connected to the pump wheel. The pump wheel is connected to the transfer gear. A power take-off port is provided inside the housing, and the power take-off gear is supported by bearings at the power take-off port and meshes with the transfer gear to form a power take-off device to transmit power. This document can solve the problem that existing hydraulic torque converters, due to their transfer box structure, have a large number of component links in the dimensional chain, resulting in smaller tolerances allocated to each component link, thus causing processing difficulties and high manufacturing costs.

[0004] However, the transmission system described in this paper only uses a hydraulic torque converter to transmit power. This method can easily lead to a smaller adjustable efficiency range between the engine and the torque converter, which is not conducive to practical applications such as bulldozers with different power outputs. Summary of the Invention

[0005] This invention provides a transmission system for a bulldozer, which combines hydraulic transmission and mechanical transmission to increase the adjustable efficiency range between the engine and the torque converter, thereby facilitating the adaptation of bulldozers with different power outputs.

[0006] To achieve the above objectives, the technical solution of the present invention is: a transmission system for a bulldozer, comprising an engine, a torque converter module, a speed change module, and a travel module. The engine is connected to the torque converter module, and the torque converter module is connected to the travel module through the speed change module. The torque converter module is disposed within a torque converter housing. The torque converter module includes a torque converter drive shaft, a hydraulic transmission assembly, and a mechanical transmission assembly. One end of the torque converter drive shaft is connected to the speed change module. The engine is connected to one end of the torque converter drive shaft via the hydraulic transmission assembly, and the other end of the engine is connected to the other end of the torque converter drive shaft via the mechanical transmission assembly. The engine drives the hydraulic transmission assembly and the mechanical transmission assembly to synchronously output power to the torque converter drive shaft.

[0007] The transmission module is housed within the gearbox and includes a transmission shaft, a clutch assembly, and a transmission assembly. The torque converter shaft extends into the gearbox and connects to the transmission shaft. The transmission assembly is connected to the transmission shaft via the clutch assembly and is connected to the travel module. The torque converter shaft drives the transmission shaft to rotate. When the clutch assembly engages, the transmission shaft drives the clutch assembly to rotate and outputs power to the transmission assembly, which in turn drives the travel module to operate.

[0008] The aforementioned structure, by incorporating both a mechanical transmission component and a hydraulic transmission component within the torque converter, allows the torque converter drive shaft to output power via both the mechanical and hydraulic transmission components. This synchronized power output through the mechanical and hydraulic transmission components increases the adjustable efficiency range between the engine and the torque converter, facilitating compatibility with bulldozers of varying power outputs. Furthermore, the presence of a clutch component within the gearbox enables the torque converter drive shaft to rotate. When the clutch component engages, the gearbox drive shaft rotates the clutch component and outputs power to the gearbox drive assembly, which in turn drives the travel module to operate.

[0009] Furthermore, a drive wheel assembly is provided between the engine and the torque converter module. The drive wheel assembly includes a first drive wheel and a second drive wheel. The first drive wheel is connected to the drive end of the engine, and the second drive wheel is connected to the first drive wheel through a fixing pin. The second drive wheel is connected to the hydraulic transmission assembly and the mechanical transmission assembly.

[0010] The above setup involves the engine driving the first drive wheel to rotate, which in turn drives the second drive wheel to rotate, thereby transmitting power to the hydraulic transmission components and the mechanical transmission components via the second drive wheel.

[0011] Furthermore, the hydraulic transmission assembly includes a hydraulic transmission gear and a hydraulic torque converter. The hydraulic transmission gear meshes with the second drive wheel, and the hydraulic torque converter is provided on the hydraulic transmission gear. The hydraulic torque converter is connected to the torque converter drive shaft and outputs power to the torque converter drive shaft.

[0012] The above setup uses a hydraulic transmission gear that follows the rotation of the second drive wheel to drive the hydraulic torque converter, thereby outputting power to the torque converter shaft and causing it to rotate.

[0013] Furthermore, the mechanical transmission assembly includes a mechanical transmission gear, an inner ring transmission gear, a first transmission connecting plate, and a second transmission connecting plate. The first transmission connecting plate is disposed on the second drive wheel. The mechanical transmission gear is disposed on the first transmission connecting plate. The inner ring transmission gear is sleeved on the mechanical transmission gear and meshes with the mechanical transmission gear. The second transmission connecting plate is disposed on the inner ring transmission gear and is connected to the torque converter transmission shaft.

[0014] The above configuration involves the second drive wheel driving the first transmission connecting plate to rotate, which in turn causes the mechanical transmission gear to drive the inner ring transmission gear to rotate. This allows the second transmission connecting plate, which is mounted on the inner ring transmission gear, to output power to the torque converter transmission shaft and drive the torque converter transmission shaft to rotate.

[0015] Furthermore, the clutch assembly includes a first clutch connecting plate, a second clutch connecting plate, and a clutch. The first clutch connecting plate is connected to the transmission shaft, the second clutch connecting plate is connected to the transmission assembly, one end of the clutch is connected to the first clutch connecting plate, and the other end of the clutch is connected to the second clutch connecting plate.

[0016] The above configuration, through the clutch setting, ensures that when the walking module needs to be driven, the clutch is engaged, causing the transmission shaft to rotate the clutch assembly and output power to the transmission assembly, which in turn drives the walking module to operate.

[0017] Furthermore, the transmission assembly includes a transmission connecting plate, a first transmission gear, and a second transmission gear. The transmission connecting plate is disposed on the second clutch connecting plate. The first transmission gear is disposed on the transmission connecting plate. The second transmission gear is rotatably disposed in the gearbox via a transmission gear bearing. The second transmission gear meshes with the first transmission gear. The second transmission gear is connected to the travel module.

[0018] One end of the speed change connecting plate is connected to the speed change transmission shaft via a bearing, and the other end of the speed change connecting plate is frictionally connected to the speed change transmission shaft via an elastic plate.

[0019] With the above setup, when the clutch is engaged, the transmission shaft outputs power through the clutch to the first gear, which in turn drives the second gear to rotate, thereby driving the walking module to move.

[0020] Furthermore, the walking module includes a walking drive shaft, a walking drive gear, and a walking driven gear. The walking drive gear is mounted on the second gear of the transmission. The walking driven gear is located in the gearbox on one side of the second gear of the transmission. The walking driven gear and the walking drive gear mesh with each other. The walking drive shaft is mounted on the walking driven gear and extends to the outside of the gearbox and is connected to the walking component.

[0021] The above configuration involves the driven gear meshing with the drive gear on the second gear of the transmission, so that when the second gear of the transmission rotates, it drives the driven gear to rotate, thereby causing the drive shaft to rotate and driving the walking components to move.

[0022] Furthermore, the walking drive gear is a bevel gear, and the walking driven gear has bevel teeth corresponding to the walking drive gear.

[0023] The above configuration, through the bevel gears, allows the transmission direction between gears to be changed, thereby facilitating the structural layout within the gearbox and the installation position of the traveling components.

[0024] Furthermore, a coupling is provided between the speed change drive shaft and the torque change drive shaft.

[0025] The above settings facilitate the connection between the speed change drive shaft and the torque change drive shaft through the coupling.

[0026] Furthermore, the drive wheel assembly also includes a third drive wheel, which is mounted on the torque converter via a drive wheel bearing. The third drive wheel meshes with the first drive wheel and is also connected to an external transmission mechanism. The engine drives the first drive wheel to rotate and drives the third drive wheel to output power to the external transmission mechanism.

[0027] The above configuration, by setting a third drive wheel, allows the engine to easily connect to an external transmission mechanism and output power. Attached Figure Description

[0028] Figure 1 This is an internal schematic diagram of the transmission system of the present invention.

[0029] Figure 2 This is a top view of the transmission system of the present invention.

[0030] Figure 3 for Figure 1 Enlarged view of point A in the middle.

[0031] Figure 4 for Figure 1 Enlarged view of point B in the middle.

[0032] Figure 5 for Figure 4 Enlarged view at point C Detailed Implementation

[0033] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0034] like Figures 1-5 As shown, a transmission system for a bulldozer includes an engine 1, a torque converter 2, a transmission module 3, and a travel module 4. The engine 1 is connected to the torque converter 2, and the torque converter 2 is connected to the travel module 4 through the transmission module 3. The torque converter 2 is housed within a torque converter box 20. The torque converter 2 includes a torque converter drive shaft 21, a hydraulic transmission assembly 22, and a mechanical transmission assembly 23. One end of the torque converter drive shaft 21 is connected to the transmission module 3. The engine 1 is connected to one end of the torque converter drive shaft 21 through the hydraulic transmission assembly 22, and the other end of the engine 1 is connected to the other end of the torque converter drive shaft 21 through the mechanical transmission assembly 23. The engine 1 drives the hydraulic transmission assembly 22 and the mechanical transmission assembly 23 to synchronously output power to the torque converter drive shaft 21.

[0035] The transmission module 3 is housed within the gearbox 30. The transmission module 3 includes a transmission shaft 31, a clutch assembly 32, and a transmission assembly 33. A torque converter shaft 21 extends into the gearbox and connects to the transmission shaft 31. A coupling 5 is also provided between the transmission shaft 31 and the torque converter shaft 21. The coupling 5 facilitates the connection between the transmission shaft 31 and the torque converter shaft 21. The transmission assembly 33 is connected to the transmission shaft 31 via the clutch assembly 32, and is also connected to the travel module 4. The torque converter shaft 21 drives the transmission shaft 31 to rotate. When the clutch assembly 32 is engaged, the transmission shaft 31 drives the clutch assembly 32 to rotate and outputs power to the transmission assembly 33, which in turn drives the travel module 4 to operate.

[0036] like Figure 3 As shown, a drive wheel assembly is provided between the engine 1 and the torque converter module 2. The drive wheel assembly includes a first drive wheel 11 and a second drive wheel 12. The first drive wheel 11 is connected to the drive end of the engine 1, and the second drive wheel 12 is connected to the first drive wheel 11 via a fixing pin 13. The second drive wheel 12 is connected to the hydraulic transmission assembly 22 and the mechanical transmission assembly 23. The engine 1 drives the first drive wheel 11 to rotate, which in turn drives the second drive wheel 12 to rotate, thereby outputting power to the hydraulic transmission assembly 22 and the mechanical transmission assembly 23 through the second drive wheel 12.

[0037] like Figure 1 and Figure 3 As shown, the hydraulic transmission assembly 22 includes a hydraulic transmission gear 221 and a hydraulic torque converter 222. In this embodiment, the hydraulic torque converter is a device that transmits power and torque through fluid flow. The hydraulic transmission gear 221 meshes with the second drive wheel 12. The hydraulic torque converter 222 is mounted on the hydraulic transmission gear 221 and is connected to the torque converter shaft 21, outputting power to the torque converter shaft 21. The hydraulic transmission gear 221 rotates following the second drive wheel 12, thereby driving the hydraulic torque converter 222 to operate, thus outputting power to the torque converter shaft 21 and causing the torque converter shaft 21 to rotate.

[0038] like Figure 1 He Ru Figure 3 As shown, the mechanical transmission assembly 23 includes a mechanical transmission gear 231, an inner ring transmission gear 232, a first transmission connecting plate 233, and a second transmission connecting plate 234. The first transmission connecting plate 233 is mounted on the second drive wheel 12. The mechanical transmission gear 231 is mounted on the first transmission connecting plate 233, and the inner ring transmission gear 232 is sleeved on and meshes with the mechanical transmission gear 231. The second transmission connecting plate 234 is mounted on the inner ring transmission gear 232 and is connected to the torque converter transmission shaft 21. The second drive wheel 12 drives the first transmission connecting plate 233 to rotate, thereby causing the mechanical transmission gear 231 to drive the inner ring transmission gear 232 to rotate. This allows the second transmission connecting plate 234 mounted on the inner ring transmission gear 232 to output power to the torque converter transmission shaft 21 and drive the torque converter transmission shaft 21 to rotate.

[0039] like Figure 1 As shown, the clutch assembly 32 includes a first clutch connecting plate 321, a second clutch connecting plate 322, and a clutch 323. The first clutch connecting plate 321 is connected to the transmission shaft 31, and the second clutch connecting plate 322 is connected to the transmission assembly 33. One end of the clutch 323 is connected to the first clutch connecting plate 321, and the other end of the clutch 323 is connected to the second clutch connecting plate 322. With the clutch 323, when the walking module 4 needs to be driven, by engaging the clutch 323, the transmission shaft 31 drives the clutch assembly 32 to rotate and outputs power to the transmission assembly 33, which then drives the walking module 4 to operate.

[0040] like Figure 1 and Figure 4As shown, the transmission assembly 33 includes a transmission connecting plate 331, a first transmission gear 332, and a second transmission gear 333. The transmission connecting plate 331 is mounted on a second clutch connecting plate 322. The first transmission gear 332 is mounted on the transmission connecting plate 331. The second transmission gear 333 is rotatably mounted in the gearbox 30 via a transmission gear bearing (not shown in the figure). The second transmission gear 333 meshes with the first transmission gear 332 and is connected to the travel module 4. When the clutch 323 is engaged, the transmission shaft 31 outputs power through the clutch 323 to the first transmission gear 332, thereby driving the second transmission gear 333 to rotate, thus driving the travel module 4 to move.

[0041] like Figure 1 and Figure 5 As shown, one end of the gear shift connecting plate 331 is connected to the gear shift transmission shaft 31 via a bearing 334, and the other end of the gear shift connecting plate 331 is frictionally connected to the gear shift transmission shaft 31 via an elastic plate 335. In this embodiment, the elastic plate 335 includes a main plate 3351 and an extension plate 3352. The extension plate 3352 is disposed on both sides of the main plate 3351. One end of the extension plate 3352 is connected to the main plate 3351, and the other end of the extension plate 3352 extends outward, upward, and downward in an arc shape. The height of the other end of the extension plate 3352 is higher than the bottom end of the main plate 3351. The top of the extension plate 3352 is connected to the gear shift connecting plate 331, and the bottom of the main plate 3351 is frictionally connected to the gear shift transmission shaft 31. The other end of the plate 3352 forms a clearance zone 3353 between the transmission shaft 31 and the transmission plate 335. The elastic plate 335 provides support between the transmission plate 331 and the transmission shaft 31. The clearance zone 3353 between the other end of the extension plate 3352 and the transmission shaft 31 also provides a certain buffering effect between the transmission plate 331 and the transmission shaft 31, which facilitates the stable connection of the transmission plate 331 and does not easily affect the operation of the transmission shaft 31.

[0042] like Figure 1 , Figure 2 and Figure 4As shown, the walking module 4 includes a walking drive shaft 41, a walking drive gear 42, and a walking driven gear 43. The walking drive gear 42 is mounted on the second gear 333. The walking driven gear 43 is located inside the gearbox 30 on one side of the second gear 333. The walking driven gear 43 meshes with the walking drive gear 42. The walking drive shaft 41 is mounted on the walking driven gear 43 and extends to the outside of the gearbox 30, connecting with the walking component 45. Because the walking driven gear 43 meshes with the walking drive gear 42 mounted on the second gear 333, the rotation of the second gear 333 drives the walking driven gear 43 to rotate, thereby causing the walking drive shaft 41 to rotate and driving the walking component 45 to move.

[0043] The drive gear 42 is a bevel gear, and the driven gear 43 has bevel teeth corresponding to the drive gear 42. The bevel gear design allows for changes in the transmission direction between gears, facilitating structural arrangement within the gearbox and simplifying the installation of the walking components.

[0044] like Figure 3 As shown, the drive wheel assembly also includes a third drive wheel 14, which is mounted on the torque converter 20 via a drive wheel bearing 15. The third drive wheel 14 meshes with the first drive wheel 11. The third drive wheel 14 is also connected to an external transmission mechanism (not shown in the figure). The engine 1 drives the first drive wheel 11 to rotate and drives the third drive wheel 14 to output power to the external transmission mechanism. By providing the third drive wheel 14, the engine can easily connect to the external transmission mechanism and output power.

[0045] The working principle of this invention is as follows: By setting a mechanical transmission component 23 and a hydraulic transmission component 22 in the torque converter 20, the torque converter drive shaft 21 can output power through the mechanical transmission component 23 on one hand and through the hydraulic transmission component 22 on the other hand. Thus, the mechanical transmission component 23 and the hydraulic transmission component 22 can output power synchronously, thereby increasing the adjustable efficiency range between the engine 1 and the torque converter, which is convenient for adapting to bulldozers with different power. At the same time, by setting a clutch component 32 in the gearbox 30, the torque converter drive shaft 21 drives the transmission shaft 31 to rotate. When the clutch component is engaged, the transmission shaft 31 drives the clutch component 32 to rotate and outputs power to the transmission component 33, which drives the walking module 4 to work.

Claims

1. A transmission system for a bulldozer, comprising an engine, a torque converter module, a transmission module, and a travel module, wherein the engine is connected to the torque converter module, and the torque converter module is connected to the travel module via the transmission module, characterized in that: The torque converter module is installed inside the torque converter box. The torque converter module includes a torque converter drive shaft, a hydraulic transmission assembly, and a mechanical transmission assembly. One end of the torque converter drive shaft is connected to the transmission module. The engine is connected to one end of the torque converter drive shaft through the hydraulic transmission assembly, and the other end of the engine is connected to the other end of the torque converter drive shaft through the mechanical transmission assembly. The engine drives the hydraulic transmission assembly and the mechanical transmission assembly to output power to the torque converter drive shaft synchronously. The transmission module is housed within the gearbox and includes a transmission shaft, a clutch assembly, and a transmission assembly. The torque converter shaft extends into the gearbox and connects to the transmission shaft. The transmission assembly is connected to the transmission shaft via the clutch assembly and is connected to the travel module. The torque converter shaft drives the transmission shaft to rotate. When the clutch assembly is engaged, the transmission shaft drives the clutch assembly to rotate and outputs power to the transmission assembly, which in turn drives the travel module to operate. A drive wheel assembly is provided between the engine and the torque converter module. The drive wheel assembly includes a first drive wheel and a second drive wheel. The first drive wheel is connected to the drive end of the engine, and the second drive wheel is connected to the first drive wheel through a fixing pin. The second drive wheel is connected to the hydraulic transmission assembly and the mechanical transmission assembly. The hydraulic transmission assembly includes a hydraulic transmission gear and a hydraulic torque converter. The hydraulic transmission gear meshes with a second drive wheel. A hydraulic torque converter is provided on the hydraulic transmission gear. The hydraulic torque converter is connected to a torque converter shaft and outputs power to the torque converter shaft. The mechanical transmission assembly includes a mechanical transmission gear, an inner ring transmission gear, a first transmission connecting plate, and a second transmission connecting plate. The first transmission connecting plate is disposed on the second drive wheel. The mechanical transmission gear is disposed on the first transmission connecting plate. The inner ring transmission gear is sleeved on the mechanical transmission gear and meshes with the mechanical transmission gear. The second transmission connecting plate is disposed on the inner ring transmission gear and is connected to the torque converter transmission shaft.

2. The transmission system of a bulldozer according to claim 1, characterized in that: The clutch assembly includes a first clutch connecting plate, a second clutch connecting plate, and a clutch. The first clutch connecting plate is connected to the transmission shaft, the second clutch connecting plate is connected to the transmission assembly, one end of the clutch is connected to the first clutch connecting plate, and the other end of the clutch is connected to the second clutch connecting plate.

3. The transmission system of a bulldozer according to claim 2, characterized in that: The transmission assembly includes a transmission connecting plate, a first transmission gear, and a second transmission gear. The transmission connecting plate is disposed on the second clutch connecting plate. The first transmission gear is disposed on the transmission connecting plate. The second transmission gear is rotatably disposed in the gearbox via a transmission gear bearing. The second transmission gear meshes with the first transmission gear. The second transmission gear is connected to the travel module. One end of the speed change connecting plate is connected to the speed change transmission shaft via a bearing, and the other end of the speed change connecting plate is frictionally connected to the speed change transmission shaft via an elastic plate.

4. The transmission system of a bulldozer according to claim 3, characterized in that: The walking module includes a walking drive shaft, a walking drive gear, and a walking driven gear. The walking drive gear is mounted on the second gear of the transmission. The walking driven gear is located inside the gearbox on one side of the second gear of the transmission. The walking driven gear and the walking drive gear mesh with each other. The walking drive shaft is mounted on the walking driven gear and extends to the outside of the gearbox and is connected to the walking components.

5. The transmission system of a bulldozer according to claim 3, characterized in that: The driving gear is a bevel gear, and the driven gear has bevel teeth corresponding to the driving gear.

6. The transmission system of a bulldozer according to claim 1, characterized in that: A coupling is also provided between the speed change drive shaft and the torque change drive shaft.

7. The transmission system of a bulldozer according to claim 1, characterized in that: The drive wheel assembly also includes a third drive wheel, which is mounted on the torque converter via a drive wheel bearing. The third drive wheel meshes with the first drive wheel and is also connected to an external transmission mechanism. The engine drives the first drive wheel to rotate and drives the third drive wheel to output power to the external transmission mechanism.

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