Transmission system of bulldozer

Abstract

The transmission system of the bulldozer comprises an engine, a torque conversion module, a speed change module and a walking module, the engine is connected with the torque conversion module, the torque conversion module is connected with the walking module through the speed change module, the torque conversion module is arranged in a torque conversion box, and the torque conversion module comprises a torque conversion transmission shaft, a hydraulic transmission assembly and a mechanical transmission assembly. One end of the variable-torque transmission shaft is connected with the speed change module, the engine is connected with one end of the variable-torque transmission shaft through the hydraulic transmission assembly on one hand, the engine is connected with the other end of the variable-torque transmission shaft through the mechanical transmission assembly on the other hand, and the engine drives the hydraulic transmission assembly and the mechanical transmission assembly to synchronously output power to the variable-torque transmission shaft. Hydraulic transmission and mechanical transmission are combined, so that the adjustable efficiency range between the engine and the torque converter is enlarged, and bulldozers with different powers can be conveniently adapted.

Description

Technical Field

[0001] The present invention relates to the technical field of transmission systems, and in particular to a transmission system of a bulldozer. Background Art

[0002] Among the existing high-power bulldozers, most of them adopt mechanical-hydraulic transmission, and the hydraulic torque converter is mainly composed of a transfer case + a torque converter. The engine power first passes through the transfer case, and two sets of power take-off devices are set inside the transfer case. Part of the power is output from the power take-off port to the whole machine pilot pump, speed pump and steering pump through the transfer case power take-off device to realize the whole machine work, steering and other functions; the other part of the power is output to the gearbox through the torque converter to realize the whole machine travel, traction and other functions. This structure adds a transfer case structure between the torque converter and the engine. When designing the tolerance of the dimension chain, due to the large number of component rings in the dimension chain, the tolerance allocated to each component ring becomes smaller, which makes processing difficult and the manufacturing cost high.

[0003] The prior art, such as the Chinese patent application No. 201720828211.3 and the authorization announcement date of April 6, 2018, discloses a bulldozer hydraulic torque converter, which relates to the field of engineering machinery. It includes a cover wheel, a turbine, a housing, a pump wheel, a guide wheel, a bearing, a power take-off gear and a transfer gear; a gear connected to the engine ring gear is provided at one end of the cover wheel, 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 a bearing 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 the existing hydraulic torque converter adopts a transfer case structure, and when designing the dimension chain tolerance, the number of component rings in the dimension chain is large, and the tolerance allocated to each component ring becomes smaller, which causes processing difficulties and high manufacturing costs.

[0004] However, the transmission system of this document only uses a hydraulic torque converter to achieve power transmission, which easily leads to a smaller adjustable efficiency range between the engine and the torque converter, which is not conducive to practical application in dealing with bulldozers of different powers. Summary of the invention

[0005] The present invention provides a transmission system for a bulldozer, which combines hydraulic transmission with mechanical transmission, thereby increasing the adjustable efficiency range between an engine and a torque converter, thereby facilitating adaptation to bulldozers of different powers.

[0006] To achieve the above-mentioned purpose, the technical solution of the present invention is: a transmission system of a bulldozer, including an engine, a torque converter module, a speed change module and a travel module, the engine is connected to the torque converter module, the torque converter module is connected to the travel module through the speed change module, the torque converter module is arranged in a torque converter box, the torque converter module includes a torque converter shaft, a hydraulic transmission component and a mechanical transmission component, one end of the torque converter shaft is connected to the speed change module, the engine is connected to one end of the torque converter shaft through the hydraulic transmission component on the one hand, and the engine is connected to the other end of the torque converter shaft through the mechanical transmission component on the other hand, the engine drives the hydraulic transmission component and the mechanical transmission component to synchronously output power to the torque converter shaft.

[0007] The speed change module is arranged in the gearbox, and the speed change module includes a speed change transmission shaft, a clutch assembly and a speed change transmission assembly. The torque change transmission shaft extends into the gearbox and is connected to the speed change transmission shaft. The speed change transmission assembly is connected to the speed change transmission shaft through the clutch assembly. The speed change transmission assembly is connected to the travel module; the torque change transmission shaft drives the speed change transmission shaft to rotate. When the clutch assembly is engaged, the speed change transmission shaft drives the clutch assembly to rotate and outputs power to the speed change transmission assembly, and drives the travel module to work through the speed change transmission assembly.

[0008] The above structure, by arranging a mechanical transmission component and a hydraulic transmission component in the torque converter box, enables the torque converter shaft to output power through the mechanical transmission component on the one hand, and also output power through the hydraulic transmission component on the other hand, thereby synchronously outputting power through the mechanical transmission component and the hydraulic transmission component, thereby increasing the adjustable efficiency range between the engine and the torque converter, thereby facilitating the adaptation of bulldozers of different power. At the same time, by arranging a clutch component in the gearbox, the torque converter shaft drives the speed change transmission shaft to rotate. When the clutch component is engaged, the speed change transmission shaft drives the clutch component to rotate and outputs power to the speed change transmission component, and drives the travel module to work through the speed change transmission component.

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

[0010] The above arrangement drives the first drive wheel to rotate through the engine, thereby driving the second drive wheel to rotate, thereby outputting power to the hydraulic transmission component and the mechanical transmission component through the second drive wheel.

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

[0012] The above arrangement drives the hydraulic torque converter to operate by the hydraulic transmission gear following the rotation of the second drive wheel, thereby outputting power to the torque converter shaft and driving the torque converter shaft 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 arranged on the second driving wheel, a mechanical transmission gear is provided on the first transmission connecting plate, the inner ring transmission gear is sleeved on the mechanical transmission gear and meshed with the mechanical transmission gear, a second transmission connecting plate is provided on the inner ring transmission gear, and the second transmission connecting plate is connected to the torque converter shaft.

[0014] The above arrangement drives the first transmission connecting plate to rotate through the second driving wheel, thereby causing the mechanical transmission gear to drive the inner ring transmission gear to rotate, thereby causing the second transmission connecting plate arranged on the inner ring transmission gear to output power to the torque converter shaft and drive the torque converter 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 speed transmission shaft, the second clutch connecting plate is connected to the speed 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 configuration of the clutch, when the walking module needs to be driven to move, the clutch is engaged, the speed transmission shaft drives the clutch assembly to rotate and outputs power to the speed transmission assembly, and the speed transmission assembly drives the walking module to work. Furthermore, the speed transmission assembly includes a speed connecting plate, a first speed gear and a second speed gear. The speed connecting plate is arranged on the second clutch connecting plate, and the first speed gear is provided on the speed connecting plate. The second speed gear is rotatably arranged in the gearbox through a speed gear bearing, and the second speed gear is meshed with the first speed gear, and the second speed gear is connected to the walking module.

[0017] One end of the speed change connecting plate is connected to the speed change transmission shaft through a bearing, and the other end of the speed change connecting plate is frictionally connected to the speed change transmission shaft through an elastic plate.

[0018] With the above arrangement, when the clutch is engaged, the speed transmission shaft outputs power through the clutch to the first speed gear, thereby driving the second speed gear to rotate, thereby driving the travel module to move through the second speed gear.

[0019] Furthermore, the walking module includes a walking drive shaft, a walking drive gear and a walking driven gear. The walking drive gear is arranged on the second speed change gear. A walking driven gear is arranged in the gearbox on one side of the second speed change gear. The walking driven gear and the walking drive gear are meshed. A walking drive shaft is arranged on the walking driven gear. The walking drive shaft extends to the outside of the gearbox and is connected to the walking component.

[0020] The above arrangement meshes the travel driven gear with the travel driving gear arranged on the second speed gear, so that when the second speed gear rotates, the travel driven gear can be driven to rotate, thereby causing the travel driving shaft to rotate and drive the travel component to move.

[0021] Furthermore, the travel driving gear is a bevel gear, and the travel driven gear is provided with bevel teeth corresponding to the travel driving gear.

[0022] The above arrangement, through the arrangement of bevel gears, enables the transmission direction between the gears to be changed, thereby facilitating the structural arrangement within the gearbox and also facilitating the installation position of the traveling components.

[0023] Furthermore, a coupling is provided between the speed-changing transmission shaft and the torque-changing transmission shaft.

[0024] The above arrangement facilitates the connection between the speed-changing transmission shaft and the torque-changing transmission shaft through the arrangement of the coupling.

[0025] Furthermore, the drive wheel assembly also includes a third drive wheel, which is arranged on the torque converter through a drive wheel bearing, the third drive wheel is meshed with the first drive wheel, and the third drive wheel 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.

[0026] The above arrangement, by providing a third drive wheel, enables the engine to be easily connected to an external transmission mechanism and output power. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is an internal schematic diagram of the transmission system of the present invention.

[0028] Figure 2 It is a top view of the transmission system of the present invention.

[0029] Figure 3 for Figure 1 Enlarged view of point A in the middle.

[0030] Figure 4 for Figure 1 Enlarged view of point B in the middle.

[0031] Figure 5 for Figure 4 Enlarged view of point C in the middle DETAILED DESCRIPTION The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0032] like Figure 1-Figure 5 As shown; a transmission system of a bulldozer, including an engine 1, a torque conversion module 2, a speed change module 3 and a travel module 4, the engine 1 is connected to the torque conversion module 2, the torque conversion module 2 is connected to the travel module 4 through the speed change module 3, the torque conversion module 2 is arranged in a torque conversion box 20, the torque conversion module 2 includes a torque conversion transmission shaft 21, a hydraulic transmission component 22 and a mechanical transmission component 23, one end of the torque conversion transmission shaft 21 is connected to the speed change module 3, the engine 1 is connected to one end of the torque conversion transmission shaft 21 through the hydraulic transmission component 22 on the one hand, and the engine 1 is connected to the other end of the torque conversion transmission shaft 21 through the mechanical transmission component 23 on the other hand, the engine 1 drives the hydraulic transmission component 22 and the mechanical transmission component 23 to synchronously output power to the torque conversion transmission shaft 21.

[0033] The speed change module 3 is arranged in the gearbox 30, and the speed change module 3 includes a speed change transmission shaft 31, a clutch assembly 32 and a speed change transmission assembly 33. The torque change transmission shaft 21 extends into the gearbox and is connected to the speed change transmission shaft 31. A coupling 5 is also arranged between the speed change transmission shaft 31 and the torque change transmission shaft 21. The arrangement of the coupling 5 facilitates the connection between the speed change transmission shaft 31 and the torque change transmission shaft 21. The speed change transmission assembly 33 is connected to the speed change transmission shaft 31 through the clutch assembly 32, and the speed change transmission assembly 33 is connected to the travel module 4; the torque change transmission shaft 21 drives the speed change transmission shaft 31 to rotate, and when the clutch assembly 32 is engaged, the speed change transmission shaft 31 drives the clutch assembly 32 to rotate and outputs power to the speed change transmission assembly 33, and the travel module 4 is driven to work through the speed change transmission assembly 33.

[0034] like Figure 3 As shown, a driving wheel assembly is provided between the engine 1 and the torque conversion module 2, and the driving wheel assembly includes a first driving wheel 11 and a second driving wheel 12, wherein the first driving wheel 11 is connected to the driving end of the engine 1, the second driving wheel 12 is connected to the first driving wheel 11 through a fixing pin 13, and the second driving wheel 12 is connected to a hydraulic transmission assembly 22 and a mechanical transmission assembly 23. The first driving wheel 11 is driven to rotate by the engine 1, thereby driving the second driving wheel 12 to rotate, thereby outputting power to the hydraulic transmission assembly 22 and the mechanical transmission assembly 23 through the second driving wheel 12.

[0035] 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 for transmitting power and torque by liquid flow. The hydraulic transmission gear 221 is meshed with the second drive wheel 12. The hydraulic torque converter 222 is provided on the hydraulic transmission gear 221. The hydraulic torque converter 222 is connected to the torque transmission shaft 21 and outputs power to the torque transmission shaft 21. The hydraulic transmission gear 221 rotates with the second drive wheel 12 to drive the hydraulic torque converter 222 to operate, thereby outputting power to the torque transmission shaft 21 and driving the torque transmission shaft 21 to rotate.

[0036] 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 arranged on the second driving wheel 12, and a mechanical transmission gear 231 is arranged on the first transmission connecting plate 233. The inner ring transmission gear 232 is sleeved on the mechanical transmission gear 231 and meshed with the mechanical transmission gear 231. A second transmission connecting plate 234 is arranged on the inner ring transmission gear 232, and the second transmission connecting plate 234 is connected to the torque conversion transmission shaft 21. The first transmission connecting plate 233 is driven to rotate by the second driving wheel 12, thereby causing the mechanical transmission gear 231 to drive the inner ring transmission gear 232 to rotate, thereby causing the second transmission connecting plate 234 arranged on the inner ring transmission gear 232 to output power to the torque conversion transmission shaft 21 and drive the torque conversion transmission shaft 21 to rotate.

[0037] 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 speed transmission shaft 31, the second clutch connecting plate 322 is connected to the speed 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. Through the setting of the clutch 323, when it is necessary to drive the walking module 4 to move, by engaging the clutch 323, the speed transmission shaft 31 drives the clutch assembly 32 to rotate and outputs power to the speed transmission assembly 33, and the speed transmission assembly 33 drives the walking module 4 to work.

[0038] like Figure 1 and Figure 4As shown, the speed transmission assembly 33 includes a speed connection plate 331, a first speed gear 332 and a second speed gear 333. The speed connection plate 331 is arranged on the second clutch connection plate 322, and the first speed gear 332 is arranged on the speed connection plate 331. The second speed gear 333 is rotatably arranged in the gearbox 30 through a speed gear bearing (not shown in the figure). The second speed gear 333 is meshed with the first speed gear 332, and the second speed gear 333 is connected to the travel module 4. When the clutch 323 is engaged, the speed transmission shaft 31 outputs power to the first speed gear 332 through the clutch 323, thereby driving the second speed gear 333 to rotate, thereby driving the travel module 4 to move through the second speed gear 333.

[0039] like Figure 1 and Figure 5 As shown, one end of the speed change connecting plate 331 is connected to the speed change transmission shaft 31 through a bearing 334, and the other end of the speed change connecting plate 331 is frictionally connected to the speed change transmission shaft 31 through an elastic plate 335. In this embodiment, the elastic plate 335 includes a main plate 3351 and an extension plate 3352, and the extension plate 3352 is arranged 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 is extended outwardly, upwardly and downwardly in an arc shape. 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 speed change connecting plate 331, and the bottom of the main plate 3351 is frictionally connected to the speed change transmission shaft 31. An escape zone 3353 is formed between the other end of the plate 3352 and the speed transmission shaft 31. Through the setting of the elastic plate 335, a supporting effect is provided between the speed connection plate 331 and the speed transmission shaft 31. Moreover, since an escape zone 3353 is formed between the other end of the extension plate 3352 and the speed transmission shaft 31, a certain buffering effect is also provided between the speed connection plate 331 and the speed transmission shaft 31, thereby facilitating a stable connection of the speed connection plate 331 and not easily affecting the operation of the speed transmission shaft 31.

[0040] 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 arranged on the second speed gear 333. The walking driven gear 43 is arranged in the gearbox 30 on one side of the second speed gear 333. The walking driven gear 43 is meshed with the walking drive gear 42. The walking driven gear 43 is arranged on the walking driven gear 43. The walking drive shaft 41 extends to the outside of the gearbox 30 and is connected to the walking component 45. The walking driven gear 43 is meshed with the walking drive gear 42 arranged on the second speed gear 333, so that when the second speed gear 333 rotates, the walking driven gear 43 can be driven to rotate, thereby causing the walking drive shaft 41 to rotate and drive the walking component 45 to move.

[0041] The travel drive gear 42 is a bevel gear, and the travel driven gear 43 is provided with bevel teeth corresponding to the travel drive gear 42. Through the arrangement of the bevel gear, the transmission direction between the gears can be changed, thereby facilitating the structural arrangement in the gearbox and also facilitating the installation position of the travel components.

[0042] like Figure 3 As shown, the driving wheel assembly also includes a third driving wheel 14, which is arranged on the torque converter 20 through a driving wheel bearing 15, and the third driving wheel 14 is meshed with the first driving wheel 11. The third driving wheel 14 is also connected to an external transmission mechanism (not shown in the figure), and the engine 1 drives the first driving wheel 11 to rotate and drives the third driving wheel 14 to output power to the external transmission mechanism. By providing the third driving wheel 14, the engine can easily connect to the external transmission mechanism and output power.

[0043] The working principle of the present invention is as follows: by arranging a mechanical transmission component 23 and a hydraulic transmission component 22 in the torque converter box 20, the torque converter shaft 21 can output power through the mechanical transmission component 23 on the one hand, and can also output power through the hydraulic transmission component 22 on the other hand, so that power output is performed synchronously through the mechanical transmission component 23 and the hydraulic transmission component 22, thereby increasing the adjustable efficiency range between the engine 1 and the torque converter, thereby facilitating adaptation to bulldozers of different power. At the same time, by arranging a clutch component 32 in the gearbox 30, the torque converter shaft 21 drives the speed change transmission shaft 31 to rotate. When the clutch component is engaged, the speed change transmission shaft 31 drives the clutch component 32 to rotate and outputs power to the speed change transmission component 33, and the speed change transmission component 33 drives the travel module 4 to work.

Claims

1. A transmission system of a bulldozer, comprising an engine, a torque conversion module, a speed change module and a travel module, wherein the engine is connected to the torque conversion module, and the torque conversion module is connected to the travel module via the speed change module, characterized in that: The torque conversion module is arranged in the torque conversion box, and the torque conversion module includes a torque conversion transmission shaft, a hydraulic transmission component and a mechanical transmission component. One end of the torque conversion transmission shaft is connected to the speed change module. On one hand, the engine is connected to one end of the torque conversion transmission shaft through the hydraulic transmission component, and on the other hand, the engine is connected to the other end of the torque conversion transmission shaft through the mechanical transmission component. The engine drives the hydraulic transmission component and the mechanical transmission component to synchronously output power to the torque conversion transmission shaft. The speed change module is arranged in the gearbox, and the speed change module includes a speed change transmission shaft, a clutch assembly and a speed change transmission assembly. The torque change transmission shaft extends into the gearbox and is connected to the speed change transmission shaft. The speed change transmission assembly is connected to the speed change transmission shaft through the clutch assembly. The speed change transmission assembly is connected to the travel module; the torque change transmission shaft drives the speed change transmission shaft to rotate. When the clutch assembly is engaged, the speed change transmission shaft drives the clutch assembly to rotate and outputs power to the speed change transmission assembly, and drives the travel module to work through the speed change transmission assembly.

2. The transmission system of a bulldozer according to claim 1, characterized in that: A drive wheel assembly is provided between the engine and the torque converter module, and 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, the second drive wheel is connected to the first drive wheel through a fixing pin, and the second drive wheel is connected to the hydraulic transmission assembly and the mechanical transmission assembly.

3. The transmission system of a bulldozer according to claim 2, characterized in that: The hydraulic transmission assembly includes a hydraulic transmission gear and a hydraulic torque converter. The hydraulic transmission gear is meshed with the second drive wheel. The hydraulic torque converter is arranged on the hydraulic transmission gear. The hydraulic torque converter is connected to the torque conversion transmission shaft and outputs power to the torque conversion transmission shaft.

4. The transmission system of a bulldozer according to claim 2, characterized in that: 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 arranged on the second driving wheel, and a mechanical transmission gear is arranged on the first transmission connecting plate. The inner ring transmission gear is sleeved on the mechanical transmission gear and meshed with the mechanical transmission gear. A second transmission connecting plate is arranged on the inner ring transmission gear, and the second transmission connecting plate is connected to the torque converter shaft.

5. 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, wherein the first clutch connecting plate is connected to the speed transmission shaft, the second clutch connecting plate is connected to the speed 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.

6. The transmission system of a bulldozer according to claim 5, characterized in that: The speed transmission assembly includes a speed connection plate, a first speed gear and a second speed gear, wherein the speed connection plate is arranged on the second clutch connection plate, the first speed gear is arranged on the speed connection plate, the second speed gear is rotatably arranged in the gearbox through a speed gear bearing, the second speed gear is meshed with the first speed gear, and the second speed gear is connected to the travel module; One end of the speed change connecting plate is connected to the speed change transmission shaft through a bearing, and the other end of the speed change connecting plate is frictionally connected to the speed change transmission shaft through an elastic plate.

7. The transmission system of a bulldozer according to claim 6, 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 arranged on the second speed change gear. A walking driven gear is arranged in the gearbox on one side of the second speed change gear. The walking driven gear and the walking drive gear are meshed. A walking drive shaft is arranged on the walking driven gear. The walking drive shaft extends to the outside of the gearbox and is connected to the walking component.

8. The transmission system of a bulldozer according to claim 6, characterized in that: The travel driving gear is a bevel gear, and the travel driven gear is provided with bevel teeth corresponding to the travel driving gear.

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

10. The transmission system of a bulldozer according to claim 2, characterized in that: The drive wheel assembly also includes a third drive wheel, which is arranged on the torque converter through a drive wheel bearing. The third drive wheel is meshed 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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