Torque conversion mechanism and heat dissipation circulation system for heavy-duty vehicle

Abstract

The invention relates to a torque conversion mechanism and a heat dissipation circulation system for a heavy-duty vehicle, belongs to the technical field of transmissions of heavy-duty vehicles, solves the technical problem of poor heat dissipation effect of transmissions of heavy-duty vehicles, and comprises an engine, a mechanical transmission, a torque converter and a rear retarder. The engine is connected with the torque converter through a bolt, the torque converter outputs power torque after torque conversion, and the mechanical transmission is connected with the torque converter through a spline. The heat dissipation circulation system comprises a whole vehicle radiator, a water tank, a water pump, a thermostat, a torque converter oil cooler, a rear retarder oil cooler and a temperature control valve. The working process of the heat dissipation circulation system comprises the water way heat dissipation circulation process, the torque converter oil way heat dissipation circulation process and the rear retarder oil way heat dissipation circulation process. The device is used for installing a torque converter and a rear retarder on a heavy-duty vehicle and dissipating heat of the heavy-duty vehicle.

Description

Technical Field

[0001] The invention belongs to the technical field of heavy-load vehicle transmissions, and in particular relates to a torque converter mechanism and a heat dissipation circulation system for heavy-load vehicles. Background Art

[0002] Large-tonnage heavy-load vehicles, high-end mining cars, large-tonnage lifting equipment, etc., due to the large full-load weight of the vehicles, require high-power engines, and use mechanical transmissions with hydraulic torque converters with locking functions. When the hydraulic torque converter works at low speed and heavy load, it can increase the starting torque of the vehicle and improve the working conditions of the shift clutch; when the hydraulic torque converter is locked at high speed and light load, it reduces power loss. The mechanical transmission is equipped with a rear retarder to provide auxiliary braking for large-tonnage heavy-load vehicles and improve the driving safety of heavy-load vehicles. However, after installing the torque converter and rear retarder, the heat dissipation of the whole vehicle is the first problem that must be solved. Summary of the invention

[0003] In order to overcome the problem of poor heat dissipation effect of a transmission in a heavy-loaded vehicle, the present invention proposes a torque converter mechanism and a heat dissipation circulation system for the heavy-loaded vehicle.

[0004] The technical solution adopted by the present invention to solve the technical problem is:

[0005] A torque conversion mechanism for a heavy-load vehicle comprises an engine, a mechanical transmission, a torque converter and a rear retarder.

[0006] The engine and the torque converter are connected by bolts, the engine inputs the power torque, and the torque converter outputs the power torque after the torque is converted.

[0007] The mechanical transmission and the torque converter are connected by a spline to change the rotation speed of the mechanical transmission.

[0008] The rear retarder is connected to the mechanical transmission and is used to provide auxiliary braking for the heavy-load vehicle.

[0009] The connecting member between the engine and the input end of the torque converter includes an engine flywheel, a flywheel connecting plate, a flexible plate, and a transition plate. The engine flywheel and the flywheel connecting plate are fixedly connected by bolts, and the flexible plate and the flywheel connecting plate are connected by bolts. The transition plate and the cover wheel of the torque converter are connected by bolts.

[0010] The connecting member between the output end of the torque converter and the mechanical transmission includes a torque converter flywheel, a driven plate, a pressure plate, a release bearing, a shift fork, and a shaft. The torque converter flywheel is the power output part of the torque converter. The driven plate is a dry friction plate, which is connected to the shaft by a spline. The friction surface is respectively engaged with the torque converter flywheel and the pressure plate surface. The pressure plate can press the driven plate tightly or separate the driven plate. The release bearing separates the driven plate by moving the shift fork.

[0011] The torque converter mechanism also includes a heat dissipation circulation system for dissipating heat from the engine, the torque converter, and the rear retarder.

[0012] The torque converter mechanism includes a flywheel connecting plate, a flexible plate, a transition plate, a cover wheel, a torque converter flywheel, a driven plate, a pressure plate, and a release bearing.

[0013] The above-mentioned torque converter mechanism, the mechanical transmission includes a shift fork and a shaft.

[0014] The torque converter mechanism is a locking type torque converter.

[0015] Under heavy-load starting or heavy-load escape conditions, the torque converter works to increase traction and achieve the functions of heavy-load starting and escape. Under normal conditions, the torque converter is locked to achieve a rigid connection with the engine.

[0016] A heat dissipation circulation system comprises a vehicle radiator, a water tank, a water pump, a thermostat, a torque converter oil cooler, a rear retarder oil cooler and a temperature control valve.

[0017] The heat dissipation circulation system is used for the torque converter mechanism of heavy-load vehicles. The working process includes the water circuit heat dissipation circulation process, the torque converter oil circuit heat dissipation circulation process, and the rear retarder oil circuit heat dissipation circulation process.

[0018] The water cooling cycle process is as follows: the water pump works, and the coolant in the water tank passes through the water pump, the engine, the torque converter oil cooler, the rear retarder oil cooler, and enters the thermostat. The coolant flowing out of the thermostat either flows through the vehicle radiator for heat dissipation and returns to the water tank, or directly returns to the water tank.

[0019] The heat dissipation cycle of the torque converter oil circuit is as follows: the cooling oil flowing out of the torque converter flows through the temperature control valve, and the cooling oil flowing out of the temperature control valve either flows through the torque converter oil cooler to dissipate heat and then flows back to the torque converter, or directly flows back to the torque converter.

[0020] The heat dissipation cycle process of the rear retarder oil circuit is as follows: the cooling oil flowing out of the rear retarder flows back to the rear retarder through the rear retarder oil cooler.

[0021] In the above heat dissipation circulation system, the coolant is water.

[0022] The above heat dissipation circulation system, the water circuit heat dissipation circulation process further includes:

[0023] When the coolant temperature reaches or exceeds the temperature threshold of the thermostat, the coolant flowing out of the thermostat flows through the vehicle radiator to dissipate heat and returns to the water tank. When the coolant temperature is lower than the temperature threshold of the thermostat, the coolant flowing out of the thermostat returns directly to the water tank.

[0024] The heat dissipation circulation system and the heat dissipation circulation process of the torque converter oil circuit further include:

[0025] The temperature control valve is a two-position three-way valve. When the temperature of the cooling oil is lower than the temperature threshold of the temperature control valve, the cooling oil flowing out of the temperature control valve flows directly back to the torque converter. When the temperature of the cooling oil is equal to or higher than the temperature threshold of the temperature control valve, the cooling oil flowing out of the temperature control valve flows through the torque converter oil cooler for heat dissipation and then flows back to the torque converter.

[0026] In the above heat dissipation circulation system, the oil circuit of the cooling oil in the torque converter oil cooler is arranged in parallel with the water circuit of the cooling oil, and the flow direction is opposite. In the rear retarder oil cooler, the oil circuit of the cooling oil is arranged in parallel with the water circuit of the cooling oil, and the flow direction is opposite.

[0027] The beneficial effects of the present invention are:

[0028] A torque converter mechanism for a heavy-load vehicle, an input and output terminal connection structure of a torque converter, and a simple and reliable solution.

[0029] A torque converter mechanism for a heavy-load vehicle, wherein an engine is connected to a torque converter, and an output end of the torque converter assembly is connected to a mechanical transmission, so that power transmission and transmission shifting operations can be performed.

[0030] A torque converter mechanism for a heavy-load vehicle, a locking torque converter, increases traction and realizes the functions of heavy-load starting and getting out of trouble. When the working conditions are good, the torque converter is locked to improve efficiency.

[0031] A heat dissipation circulation system, the middle of the oil outlet pipe is connected to a temperature control valve, the oil flows directly from the oil outlet pipe back to the oil pipe, and finally directly back to the oil pan without passing through the cooler. It will not bring heat to the engine, thus improving the engine power.

[0032] A heat dissipation circulation system, during the movement of the vehicle, the torque converter and the rear retarder work in rotation, and the thermostat is used to determine the size of the cycle according to the temperature, which effectively plays a role in energy saving. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 1 is a schematic diagram of the structure of a torque converter mechanism according to an embodiment of the present invention;

[0034] Figure 2 It is a schematic diagram of the input and output connection structure of the torque converter according to an embodiment of the present invention.

[0035] Figure numerals: 1. flywheel connecting plate, 2. engine flywheel, 3. flexible plate, 4. transition plate, 5. cover wheel, 6. torque converter flywheel, 7. driven plate, 8. primary shaft, 9. release bearing, 10. shift fork, 11. pressure plate, 12. engine, 13. mechanical transmission, 14. torque converter, 15. rear retarder, 16. vehicle radiator, 17. water tank, 18. water pump, 19. thermostat, 20. torque converter oil cooler, 21. rear retarder oil cooler, 22. temperature control valve, 23. oil outlet pipe, 24. oil return pipe. DETAILED DESCRIPTION

[0036] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0037] Embodiment 1

[0038] The connection between the engine and the torque converter assembly is as follows Figure 2 As shown, it is composed of an engine flywheel 2, a flywheel connecting plate 1, a flexible plate 3, and a transition plate 4. The flywheel and the flywheel connecting plate are fixedly connected by bolts. The lower part of the flexible plate 1 is connected to the flywheel connecting plate 1 by bolts; the upper part of the flexible plate 3 is connected to the flywheel transition plate 1 by bolts. The transition plate 4 is connected to the cover wheel 5 of the torque converter by bolts to transmit power.

[0039] The output end of the torque converter assembly is connected to the mechanical transmission, and is composed of a flywheel 6, a driven plate 7, a pressure plate 11, a release bearing 9, a shift fork 10, and a shaft 8. The flywheel 6 is the power output part of the torque converter. The driven plate 7 is a dry friction plate, which is connected to the shaft 8 with a spline. The friction surface is the two end surfaces, which are respectively engaged with the flywheel 6 and the pressure plate 11. The pressure plate 11 is a normally pressed driven plate. The driven plate 7 needs to be separated. The release bearing 9 is pulled (pushed) by the movement of the shift fork 10 to separate the driven plate 7, and the mechanical transmission is shifted.

[0040] The torque converter is a locking type torque converter. Under working conditions such as heavy-load starting and heavy-load escape, the torque converter works to increase traction and realize the functions of heavy-load starting and escape. When the working conditions are good, the torque converter is locked to achieve a rigid connection with the engine and improve efficiency.

[0041] The components of the heat dissipation circulation system include: an engine 12, a torque converter 13, a mechanical transmission 14, a rear retarder 15, a vehicle radiator 16, a water tank 17, a water pump 18, a thermostat 19, a torque converter oil cooler 20, a rear retarder oil cooler 21, water pipes, oil pipes and the like.

[0042] Water circulation: After the engine is started, it drives the water pump 18 to work, and the water pump pumps out the cooling water (liquid) in the water tank. The water pump pumps water out from the water outlet to cool the inside of the engine. The water pipe is connected in series to the torque converter oil cooler 20 and the rear retarder oil cooler 21. The water (liquid) coming out of the oil cooler enters different pipes through the thermostat 19 according to the cooling water (liquid) temperature. When the temperature is not high, it continues to circulate directly through the radiator side pipe (this cycle is also called small cycle). If the temperature is too high (reaching the temperature at which the thermostat opens), the thermostat opens, and the water (liquid) passing through the thermostat passes through the vehicle radiator 16 for cooling and then circulates in sequence (this cycle is also called large cycle).

[0043] Torque converter oil circuit: One end of the oil outlet pipe is connected to the torque converter, and the other end is connected to the torque converter oil cooler 20. A temperature control valve 22 is connected to the middle of the oil outlet pipe. The temperature control valve 22 is a two-position three-way valve and is connected to the oil outlet pipe 23. One end is connected to the bypass and communicates with the return oil pipe. One end of the return oil pipe 24 is connected to the torque converter oil cooler 20. The other end is connected to the torque converter 14 to return the cooling oil to the oil pan. The flow direction of the oil in the torque converter oil cooler 20 must be opposite to the cooling water flow direction.

[0044] Rear retarder oil circuit: The inlet and outlet oil circuits of the retarder are connected to the oil cooler respectively, and the flow direction of the oil circuit is opposite to that of the water circuit.

[0045] The engine and the torque converter 14 are connected by bolts, and the torque converter and the mechanical transmission 13 are connected by splines.

[0046] When the ambient temperature is low or the torque converter oil temperature is low, due to the temperature control valve, the torque converter oil flows directly from the oil outlet pipe back to the oil return pipe and directly back to the oil pan. It does not pass through the oil cooler. There is no need to bring heat to the engine end, which increases the engine power. It has a certain energy-saving effect.

[0047] When the engine is just started, the temperature inside the engine is not high. The torque converter and retarder are not working. The water pipe temperature is not high. At this time, the cooling water works through a small cycle.

[0048] When the vehicle starts, climbs a slope or other adverse conditions, the torque converter works, while the rear retarder 15 does not work. The torque converter generates a lot of heat when it works. When the temperature reaches the set temperature, the temperature control valve 22 on the oil outlet pipe will close the bypass, and the oil outlet pipe will pass through the oil cooler 20 for heat exchange. The cooled oil flows into the oil pan through the return oil pipe. At this time, the heat source is mainly generated by the engine and the torque converter. The thermostat 19 on the water pipeline cools the water through the vehicle radiator 16 according to the water temperature, that is, the large cycle is cooled.

[0049] When the vehicle is braking downhill, the torque converter is in a locked state, i.e., rigidly connected, and the torque converter generates very little heat. The temperature control valve determines whether to pass through the oil cooler 20 according to the temperature. The rear retarder is mainly needed to assist braking. When the retarder is working, a large amount of heat is generated, which needs to be cooled down through the oil cooler 21. Similarly, the water circuit will go through a large cycle for cooling and heat exchange.

[0050] When the vehicle is in good road conditions, the torque converter is in a locked state, the oil temperature of the torque converter does not reach the condition of the temperature control valve, and the oil output of the torque converter flows directly back to the oil pan without passing through the oil cooler 20; the retarder does not need to work. The heat is mainly generated by the engine. At this time, the thermostat determines the size of the cycle according to the temperature. It can effectively play a role in energy saving.

Claims

1. A torque converter mechanism for a heavy-duty vehicle, characterized in that: It includes an engine (12), a mechanical transmission (13), a torque converter (14), and a rear retarder (15); The engine (12) is connected to a torque converter (14), the engine (12) inputs a power torque, and the torque converter (14) outputs a converted power torque; The mechanical transmission (13) is connected to the torque converter (14) and is used to change the rotation speed of the torque converter (14); The rear retarder (15) is connected to the mechanical transmission (13) and is used to provide auxiliary braking for the heavy-loaded vehicle; A connecting member between an engine (12) and an input end of a torque converter (14), comprising an engine flywheel (2), a flywheel connecting disk (1), a flexible disk (3), and a transition disk (4); the engine flywheel (2) is fixedly connected to the flywheel connecting disk (1), the flexible disk (3) is connected to the flywheel connecting disk (1); and the transition disk (4) is connected to a cover wheel (5) of the torque converter; The connecting member between the output end of the torque converter (14) and the mechanical transmission (13) comprises a torque converter flywheel (6), a driven plate (7), a pressure plate (11), a release bearing (9), a shift fork (10), and a shaft (8). The torque converter flywheel (6) is a power output member of the torque converter; the driven plate (7) is a dry friction plate connected to the shaft (8) by a spline; the friction plate surface is respectively engaged with the torque converter flywheel (6) and the pressure plate (11); the pressure plate (11) can press the driven plate (7) or separate the driven plate (7); and the release bearing (9) is separated from the driven plate (7) by moving the shift fork (10).

2. The torque converter mechanism according to claim 1, characterized in that: It also includes a heat dissipation circulation system, which is used to dissipate heat from the engine (12), the torque converter (14), and the rear retarder (15).

3. The torque converter mechanism according to claim 1 or 2, characterized in that: The torque converter comprises a flywheel connecting disc (1), a flexible disc (3), a transition disc (4), a cover wheel (5); a torque converter flywheel (6), a driven disc (7), a pressure plate (11), and a release bearing (9).

4. The torque converter mechanism according to claim 1 or 2, characterized in that: The mechanical transmission (13) comprises a shift fork (10) and a shaft (8).

5. The torque converter mechanism according to claim 1 or 2, characterized in that: The torque converter (14) is a locking torque converter; When the heavy-load vehicle is in a heavy-load starting or heavy-load escape condition, the torque converter (14) works to increase traction and achieve the heavy-load starting and escape function; under normal conditions, the torque converter (14) is locked to achieve a rigid connection with the engine (12).

6. A heat dissipation circulation system, characterized in that: It includes a vehicle radiator (16), a water tank (17), a water pump (18), a thermostat (19), a torque converter oil cooler (20), a rear retarder oil cooler (21), and a temperature control valve (22); The heat dissipation circulation system is used for the torque converter mechanism of heavy-duty vehicles. The working process includes the water circuit heat dissipation circulation process, the torque converter oil circuit heat dissipation circulation process, and the rear retarder oil circuit heat dissipation circulation process; The water circuit heat dissipation cycle process is: The water pump (18) works, and the coolant in the water tank (17) enters the thermostat (19) through the water pump (18), the engine (12), the torque converter oil cooler (20), and the rear retarder oil cooler (21); the coolant flowing out of the thermostat (19) either flows through the vehicle radiator (16) to dissipate heat and returns to the water tank (17), or directly returns to the water tank (17); The heat dissipation cycle process of the torque converter oil circuit is as follows: The cooling oil flowing out of the torque converter (14) flows through the temperature control valve (22), and the cooling oil flowing out of the temperature control valve (22) either flows through the torque converter oil cooler (20) to dissipate heat and then flows back to the torque converter (14), or directly flows back to the torque converter (14); The heat dissipation cycle process of the post-retarder oil circuit is as follows: The cooling oil flowing out of the rear retarder (15) flows back to the rear retarder (15) through the rear retarder oil cooler (21).

7. The heat dissipation circulation system according to claim 6, characterized in that: The coolant is water.

8. The heat dissipation circulation system according to claim 6, characterized in that: The water circuit heat dissipation cycle process further includes: When the coolant temperature reaches or exceeds the temperature threshold of the thermostat (19), the coolant flowing out of the thermostat (19) flows through the vehicle radiator (16) to dissipate heat and returns to the water tank (17); when the coolant temperature is lower than the temperature threshold of the thermostat (19), the coolant flowing out of the thermostat (19) directly returns to the water tank (17).

9. The heat dissipation circulation system according to claim 6, characterized in that: The torque converter oil circuit heat dissipation cycle process further includes: The temperature control valve is a two-position three-way valve. When the temperature of the cooling oil is lower than the temperature threshold of the temperature control valve (22), the cooling oil flowing out of the temperature control valve (22) directly flows back to the torque converter (14); when the temperature of the cooling oil is equal to or higher than the temperature threshold of the temperature control valve (22), the cooling oil flowing out of the temperature control valve (22) flows through the torque converter oil cooler (20) to dissipate heat and then flows back to the torque converter (14).

10. The heat dissipation circulation system according to claim 6, characterized in that: The oil circuit of the cooling oil in the torque converter oil cooler (20) is arranged in parallel with the water circuit of the cooling oil, and the flow directions are opposite; the oil circuit of the cooling oil in the rear retarder oil cooler (21) is arranged in parallel with the water circuit of the cooling oil, and the flow directions are opposite.

Images