CN115585237A - Hydraulic torque converter, hydraulic oil circuit control system and transmission - Google Patents

Abstract

The invention discloses a hydraulic torque converter, a hydraulic oil path control system and a transmission, which belong to the technical field of hydraulic mechanical transmission. The locking oil circuit provides pressure oil for an execution cavity of the hydraulic torque converter, and the balance oil circuit provides stable and lower pressure for a balance cavity of the hydraulic torque converter; the oil inlet oil path and the oil outlet oil path provide cooling and lubricating oil paths for the hydraulic torque converter and are used for taking away heat generated when a hydraulic circulating circle and a friction plate set work, the arrangement of the four oil paths realizes accurate control on the lockup clutch, and meanwhile, the lockup pressure of the transmission is reduced, and the problems that in the prior art, when the two-channel and three-channel hydraulic torque converter works, the friction plates are stressed unevenly, and the lockup pressure of the torque converter is large are solved.

Description

Hydraulic torque converter, hydraulic oil circuit control system and transmission

Technical Field

The invention belongs to the technical field of hydraulic mechanical transmission, and relates to a hydraulic torque converter, a hydraulic oil way control system and a transmission.

Background

The hydraulic torque converter is a transmission device and is widely applied to hydraulic transmission machinery of automobiles, forklifts, engineering machinery and national defense equipment. In the working process, the power transmission is realized by mainly utilizing the conversion between mechanical energy and hydraulic power, the speed and the torque can be continuously adjusted, the automatic adjustment is realized according to external loads, the engine can realize soft start, the traction force and the speed of the main engine automatically adapt to the changes of the loads and roads, so that the adaptability of the engine is improved, the stepless speed change is realized, the gear shifting times are reduced, and the trafficability of the locomotive is improved. For a power transmission system, the existence of the hydraulic torque converter can ensure that the system can realize stable starting, the acceleration process is more uniform, the torsional vibration of an engine is greatly reduced, the impact force is reduced, and the service cycle of the power transmission system is prolonged. Because of the special torque conversion characteristic of the hydraulic torque converter, the hydraulic torque converter is widely used in the fields of military vehicles, engineering machinery and the like, particularly in equipment such as loaders, bulldozers and the like, the hydraulic torque converter is generally used as a power transmission part, and with the continuous development of the engineering machinery, how to further improve the performance of the hydraulic torque converter and reduce the energy consumption is a problem which needs to be solved urgently, so that the integration of the lockup clutch in the hydraulic torque converter becomes the current mainstream technical direction.

The main principle is that when the speed difference between a pump impeller and a turbine of the hydraulic torque converter is reduced, the torque increasing effect of the torque converter is reduced, the lockup clutch is closed at the moment, the pump impeller and the turbine are directly connected, the transmission efficiency is effectively improved, and therefore the overall economy is improved. The opening and closing of the locking clutch are mainly controlled by an electromagnetic valve, and the connection condition of a pump impeller and a turbine is further influenced. The electromagnetic valve can be integrated in a hydraulic system of the transmission, the whole system is controlled through a transmission control unit, proper locking time is selected, the locking process is controlled more accurately, and the efficiency of the hydraulic torque converter is improved.

The hydraulic torque converter in the current market is divided into two types according to a lockup clutch control method: a two-channel torque converter and a three-channel torque converter.

The traditional two-channel hydraulic torque converter comprises two oil paths: torque converter oil feed oil circuit and torque converter oil circuit that produces oil, it has following two problems at the during operation: 1. when the lockup clutch works, friction materials are required to be used for transmitting torque, the two oil ways are required to be sealed, however, in order to cool the lockup clutch during working, partial oil ways are often added on the friction materials, and when oil in a transmission flows from a high-pressure side to a low-pressure side of the friction materials, pressure is reduced, and stress of the friction materials is uneven. 2. When the transmission works, oil flows through the friction materials and must flow to the input shaft of the transmission from the outer side of the torque converter, at the moment, because the whole system rotates, the oil is subjected to Coriolis force in the process of flowing to the inner side and forms spiral flow before flowing into the input shaft of the transmission, so that back pressure is generated, and effective pressure on a friction plate is reduced.

A conventional three-way torque converter includes three oil passages: the device comprises a torque converter oil inlet oil way, a torque converter oil outlet oil way and a locking clutch locking oil way. The three-channel hydraulic torque converter lockup clutch needs to overcome the pressure of the torque converter cavity when being locked, the effective pressure acting on the friction plate set is equal to the lockup clutch lockup pressure minus the torque converter cavity pressure, and the following two problems exist during the working process: 1. the pressure of the cavity of the torque converter is high, so that the high pressure needs to be overcome when the lockup clutch is combined, the pressure requirement of the lockup cavity of the lockup clutch is increased, high requirements on the strength of related parts are provided, and the cost of raw materials is increased; 2. the pressure of a cavity of the torque converter is unstable, and the locking clutch needs to be completely locked when working, so that accurate sliding friction control cannot be realized, and the damping effect is achieved.

Disclosure of Invention

The invention aims to solve the problems of uneven stress of friction plates and large locking pressure of a torque converter when a two-channel hydraulic torque converter and a three-channel hydraulic torque converter work in the prior art, and provides a four-channel hydraulic torque converter, a hydraulic oil circuit control system and a transmission, wherein the torque converter can realize micro-sliding friction control, further realize the self-learning function of a locking clutch, ensure accurate control of continuous torque of the locking clutch and avoid the problems of uneven stress of the friction plates of the locking clutch and large locking pressure of the hydraulic torque converter; meanwhile, the torsional vibration of the engine can be weakened, so that the NVH performance of the whole vehicle is improved.

In order to achieve the purpose, the invention adopts the following technical scheme to realize the purpose:

the invention provides a hydraulic torque converter, which comprises a cover wheel assembly, a turbine assembly, a guide wheel assembly and a pump wheel assembly which are sequentially arranged on a transmission shaft;

the cover wheel assembly comprises a cover wheel, and an execution piston is arranged in the cover wheel; the gap between the execution piston and the cover wheel forms an execution cavity, and the execution cavity is connected with a locking oil way; a balance piston is arranged in the execution piston, and a balance oil way is connected with a gap between the balance piston and the execution piston; the balance oil way and the blocking oil way are communicated with the transmission shaft oil hole;

the pump wheel assembly, the guide wheel assembly and the turbine assembly form a hydraulic circulating circle together;

an oil inlet oil way is arranged between the turbine assembly and the guide wheel assembly and is communicated with the hydraulic circulating circular cavity;

an oil outlet oil way is arranged between the pump wheel assembly and the guide wheel assembly and is communicated with the hydraulic circulating circular cavity.

Preferably, a dual plate, a friction plate, a spline plate assembly and a back plate assembly are sequentially arranged between the turbine assembly and the cover wheel assembly, the spline plate assembly, the back plate assembly and the pump wheel assembly are sequentially and fixedly connected to the cover wheel assembly, the dual plate is in splined connection with the spline plate assembly, and the friction plate is jacked to abut against the back plate assembly by the dual plate; the friction plate is connected with the turbine assembly through a spline; a first thrust bearing is arranged between the turbine assembly and the cover wheel assembly, and a first gasket is arranged between the first thrust bearing and the turbine assembly.

Preferably, the spline disc assembly comprises a first sealing ring and a spline disc, the spline disc is fixedly connected with the cover wheel, and the first sealing ring is arranged between the spline disc and the cover wheel assembly;

the back plate assembly comprises a second sealing ring, a back plate and a third sealing ring, one side of the back plate is fixedly connected with the spline disc assembly, and the other side of the back plate is fixedly connected with the pump wheel assembly; the second sealing ring is arranged between the back plate and the spline disc assembly; the third sealing ring is arranged between the back plate and the pump wheel assembly.

Preferably, a second thrust bearing is arranged between the turbine assembly and the guide wheel assembly.

Preferably, a fourth sealing ring is arranged between the inner wall of the outer circle of the execution cavity in the cover wheel assembly and the outer wall of the outer circle of the execution piston, and a fifth sealing ring is arranged between the cover wheel and the inner wall of the inner circle of the execution piston; and a sixth sealing ring is arranged between the inner wall of the inner circle of the balance piston and the cover wheel.

The invention provides a hydraulic oil circuit control system which comprises the hydraulic torque converter.

Preferably, the locking oil path is connected with an energy accumulator and a proportional solenoid valve, and the proportional solenoid valve is connected with a first oil pan and a first filter; the filter is connected to a first pressure source.

Preferably, the balance oil way is connected with a pressure reducing valve, the pressure reducing valve is connected with a one-way valve and a second filter, and the second filter is connected with a second pressure source; the check valve is connected with a second oil pan.

A transmission is provided with the torque converter.

A transmission is equipped with the hydraulic oil path control system.

Compared with the prior art, the invention has the following beneficial effects:

the invention provides a hydraulic torque converter, which ensures the execution pressure of a friction plate when a locking clutch works by arranging an execution piston and a locking oil way on a cover wheel assembly; secondly, under the condition of ensuring the execution pressure of the friction plate, the balance piston is matched to isolate the lockup oil path of the lockup clutch from the cavity of the torque converter, and the balance oil path is increased, so that when the lockup clutch works, the execution piston only needs to overcome the pressure of the balance oil path, and the pressure is far less than the pressure of the cavity of the torque converter, so that the requirements on the lockup oil path pressure and the total pressure of the oil path of the lockup clutch are reduced, the strength requirement on relevant parts is reduced, and the hardware economy is improved; in addition, the balance oil circuit pressure is controlled independently and can be maintained at a known stable pressure, and the execution pressure acting on the friction plate group is equal to the locking oil circuit pressure of the locking clutch minus the known balance oil circuit pressure, so that the feasibility of the accurate sliding friction control of the locking clutch on the aspect of hardware is provided, and the locking clutch can be accurately controlled under the condition of not being influenced by other factors. The micro-sliding friction control of the locking clutch can bring better damping effect, the NVH performance of the whole vehicle is improved to a great extent, and under a higher gear, due to the accurate controllability of the four-channel hydraulic torque converter, the four-channel hydraulic torque converter can operate at a very low sliding friction rotating speed, so that the damper can be designed to be smaller in size, and the space of the hydraulic torque converter is saved.

Furthermore, the arrangement of the first thrust bearing and the second thrust bearing can ensure that the pump wheel assembly, the guide wheel assembly and the turbine wheel assembly rotate freely. The arrangement of the first sealing ring to the sixth sealing ring can ensure the sealing performance of the whole hydraulic torque converter cavity.

The invention also provides a hydraulic oil path control system, which can realize accurate sliding friction control on the working process of the lockup clutch and weaken the torsional vibration of the engine, thereby improving the NVH performance of the loaded whole vehicle and ensuring that the lockup clutch has faster response than the traditional hydraulic torque converter; in addition, the improvement of the damping performance can ensure that the transmission realizes first gear locking, thereby improving the fuel economy of the whole vehicle.

In the hydraulic oil way control system, the arrangement of the first filter and the second filter can ensure the cleanliness of the oil of the closed oil way and the balanced oil way; the arrangement of the electromagnetic valve and the energy accumulator can provide stable and controllable pressure for the oil locking circuit; the setting of relief pressure valve can provide continuous stable oil pressure for balanced oil circuit to realize the accurate smooth control that rubs of lockup clutch working process.

The transmission provided with the hydraulic torque converter or the hydraulic oil circuit control system can realize locking in the first gear, which cannot be realized on hardware of the transmission provided with the traditional two-channel and three-channel hydraulic torque converter. In addition, the one-gear locking means that the locking clutch can be used as a starting device like a hydraulic circulation circle, so that the hydraulic circulation circle can be designed to be smaller and lighter, and the fuel economy of the whole vehicle is improved.

Drawings

In order to more clearly explain the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

FIG. 1 is a partial cross-sectional view of a four-channel torque converter configuration of the present invention.

FIG. 2 is a diagram of the oil passages of the four-passage torque converter of the present invention.

FIG. 3 is an exploded view of the four channel torque converter assembly of the present invention.

FIG. 4 is an exploded view of the shroud wheel assembly of the present invention.

FIG. 5 is an exploded view of the spline disk assembly of the present invention.

FIG. 6 is an exploded view of the back plate assembly of the present invention.

Fig. 7 is a structural view of a hydraulic oil circuit control system according to the present invention.

Wherein, 1-a first bolt, 2-a cover wheel assembly, 2 a-a second bolt, 2 b-an input shaft, 2 c-a first rubber sealing ring, 2 d-a second rubber sealing ring, 2 e-an execution cavity, 2 f-a cover wheel, 2 g-an execution piston, 2 i-a fourth sealing ring, 2 h-a fifth sealing ring, 2 j-a balance piston, 2 k-a sixth sealing ring, 2 l-a retainer ring, 3-a first thrust bearing, 4-a first gasket, 5-a dual sheet, 6-a friction sheet, 7-a spline disc assembly, 7 a-a first sealing ring, 7 b-a spline disc and 8-a back plate assembly, 8 a-a second sealing ring, 8 b-a back plate, 8 c-a third sealing ring, 9-a turbine assembly, 10-a second thrust bearing, 11-a guide wheel assembly, 12-a pump wheel assembly, 13-an accumulator, 14-a proportional electromagnetic valve, 15-a first oil pan, 16-a first filter, 17 a-a closed oil circuit, 17 b-a balance oil circuit, 17 c-an oil inlet circuit, 17 d-an oil outlet circuit, 18-a first pressure source, 19-a pressure reducing valve, 20-a second filter, 21-a second oil pan, 22-a one-way valve and 23-a second pressure source.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined or explained in subsequent figures.

In the description of the embodiments of the present invention, it should be noted that if the terms "upper", "lower", "horizontal", "inner", etc. are used for indicating the orientation or positional relationship based on the orientation or positional relationship shown in the drawings or the orientation or positional relationship which is usually arranged when the product of the present invention is used, the description is merely for convenience and simplicity, and the indication or suggestion that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, cannot be understood as limiting the present invention. Furthermore, the terms "first," "second," and the like are used merely to distinguish one description from another, and are not to be construed as indicating or implying relative importance.

Furthermore, the term "horizontal", if present, does not mean that the component is required to be absolutely horizontal, but may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.

In the description of the embodiments of the present invention, it should be further noted that unless otherwise explicitly stated or limited, the terms "disposed," "mounted," "connected," and "connected" should be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood according to specific situations by those of ordinary skill in the art.

The invention is described in further detail below with reference to the accompanying drawings:

referring to fig. 1 to 3, the present invention provides a torque converter, which includes a cover wheel assembly 2, a dual plate 5, a friction plate 6, a spline plate assembly 7, a back plate assembly 8, a turbine assembly 9, a guide wheel assembly 11 and a pump wheel assembly 12; the spline disc assembly 7, the back plate assembly 8 and the pump wheel assembly 12 are fixedly connected to the cover wheel assembly 2 through the first bolt 1 in sequence; the dual plate 5 is in splined connection with a spline disc assembly 7, and the friction plate 6 is pushed to be abutted against a back plate assembly 8 by the dual plate 5; the friction plate 6 is in splined connection with the turbine assembly 9; a first thrust bearing 3 is arranged between the turbine assembly 9 and the cover wheel assembly 2, and a first gasket 4 is arranged between the first thrust bearing 3 and the turbine assembly 9; one end of the guide wheel assembly 11 is in contact with an angular contact ball bearing of the pump wheel assembly 12 for axial positioning, and a second thrust bearing 10 is assembled between the other end of the guide wheel assembly and the turbine assembly 9 for axial positioning; the turbine assembly 9 is integrated with a damper module for reducing torsional vibration of an engine, and an external spline is arranged on the outer diameter of the damper module and matched with an internal spline of the friction plate 6.

Referring to fig. 4, the cover wheel assembly 2 includes an input shaft 2b, the input shaft 2b is fixedly connected with a cover wheel 2f through a second bolt 2a, two concentric grooves are arranged on a flange surface of the input shaft 2b, a first rubber sealing ring 2c is arranged in the groove of the inner ring, and a second rubber sealing ring 2d is arranged in the groove of the outer ring, so as to ensure the sealing between the input shaft 2b of the hydraulic torque converter and the cover wheel 2 f; an execution piston 2g is arranged in the cover drawing wheel 2 f; a clearance between the execution piston 2g and the cover wheel 2f forms an execution cavity 2e, and the execution cavity 2e is connected with a closed oil way 17a; a fourth sealing ring 2i is arranged between the inner wall of the excircle of the execution cavity 2e and the outer wall of the excircle of the execution piston 2g, and a fifth sealing ring 2h is arranged between the cover wheel 2f and the inner wall of the excircle of the execution piston 2g; a balance piston 2j is arranged in the execution piston 2g and used for separating the closed oil circuit 17a from the cavity of the torque converter; a sixth sealing ring 2k is arranged between the inner circle wall of the balance piston 2j and the cover wheel 2 f; the excircle of the balance piston 2j is matched with a sealing lip of the actuating piston 2g to form sealing, and the balance piston 2j is axially limited by a retainer ring 2l fixed on the boss; a balance oil path 17b is communicated with a gap between the balance piston 2j and the execution piston 2g, and the balance oil path 17b and the locking oil path 17a are communicated with the transmission shaft oil hole;

referring to fig. 5, the spline disc assembly 7 includes a spline disc 7b, the spline disc 7b is fixedly connected with the cover wheel 2f, and a first sealing ring 7a is arranged between the spline disc 7b and the cover wheel 2 f;

referring to fig. 6, the back plate assembly 8 includes a back plate 8b, one side of the back plate 8b is fixedly connected with the spline disc assembly 7, and the other side is fixedly connected with the pump impeller assembly 12; a second sealing ring 8a is arranged between the back plate 8b and the spline disc assembly 7, and a third sealing ring 8c is arranged between the back plate 8b and the pump wheel assembly 12;

the pump wheel assembly 12, the guide wheel assembly 11 and the turbine wheel assembly 9 form a hydraulic circulating circle together;

an oil inlet path 17c is arranged between the turbine assembly 9 and the guide wheel assembly 11, and the oil inlet path 17c is communicated with the hydraulic circulating circular cavity;

an oil outlet oil path 17d is arranged between the pump wheel assembly 12 and the guide wheel assembly 11, and the oil outlet oil path 17d is communicated with the hydraulic circulating circular cavity.

The working principle is as follows: the hydraulic torque converter comprises a locking oil path 17a, a balance oil path 17b, an oil inlet oil path 17c and an oil outlet oil path 17d; the locking oil path 17a and the balance oil path 17b are used for locking and opening the locking clutch, and the oil inlet oil path 17c and the oil outlet oil path 17d are used for providing a cooling and lubricating oil path for the torque converter and taking away heat generated in the working process of the torque converter.

When the hydraulic torque converter reaches a coupling point, the locking clutch starts to work, the pressure of a locking oil path 17a starts to increase from zero, the pressure of a balance oil path 17b is overcome, an execution piston 2g is pushed to move axially towards the direction of the transmission, a dual plate 5 and a friction plate 6 are compressed to be abutted against a back plate 8b, friction force is generated, and torque is transmitted to a turbine assembly 9 from a spline plate 7 b; in the structure, the friction material is only used for transmitting torque, the sealing function similar to that of a traditional two-channel hydraulic torque converter friction plate is not needed, and the friction material is used for isolating two oil paths, so that large pressure difference does not exist between the inner side and the outer side of the friction plate 6, and the whole stress of the friction plate 6 is uniform. Meanwhile, oil does not need to flow to the input shaft of the transmission from the outer side of the torque converter, back pressure cannot be generated due to the action of Coriolis force, and therefore effective pressure on the friction plate is reduced. In the process, the oil liquid of the transmission enters the cavity of the torque converter from the oil inlet path 17c of the hydraulic torque converter and flows out from the oil outlet port 17d to take away the heat generated by the operation of the lockup clutch.

When the locking working condition is converted into the torque conversion working condition, the pressure of the locking oil passage 17a is reduced, the execution piston 2g is reset under the pressure of the balance oil passage 17b, the dual plate 5 and the friction plate 6 are not squeezed any more, and the torque is transmitted to the turbine assembly 9 from the pump wheel assembly 12.

The hydraulic circulation circle cavity is filled with the oil of the transmission through the oil inlet oil way 17c, when the whole vehicle starts, a speed difference exists between the pump wheel assembly 12 and the turbine assembly 9, the oil is filled between the blades of the pump wheel assembly 12 and the turbine assembly 9, when the pump wheel assembly 12 rotates, the oil is driven to rotate and is sent to the turbine assembly 9, the oil acts on the turbine blades, the turbine assembly 9 also rotates, a hydraulic circulation circle is formed in the hydraulic circulation cavity, hydraulic transmission is carried out under the action of the hydraulic circulation circle, a torque conversion effect is achieved, and meanwhile, the hydraulic transmission can achieve a damping effect.

A speed changer is provided with the hydraulic torque converter, can realize micro-sliding friction control of the hydraulic torque converter, further realize self-learning function of the locking clutch, can ensure continuous accurate torque control of the locking clutch through self-learning, can reduce engine torsional vibration through sliding friction control of the locking clutch, enables the speed changer to realize locking at a lower gear, and improves fuel economy of a finished automobile.

Referring to fig. 7, the invention further provides a hydraulic oil path control system including the hydraulic torque converter, the lockup oil path 17a is connected with an energy accumulator 13 and a proportional solenoid valve 14, the proportional solenoid valve 14 is a normally closed solenoid valve and is connected with a vehicle control unit, when the lockup clutch works, the proportional solenoid valve 14 is controlled by the control unit current to act, oil pressure is provided for the lockup oil path 17a, and the arrangement of the energy accumulator 13 can stabilize the outlet pressure of the proportional solenoid valve 14; the proportional solenoid valve 14 is connected with a first oil pan 15 and a first filter 16; a first pressure source 18 is connected to the filter 16 for supplying oil pressure to the lock-up oil passage 17a, the first pressure source 18 normally being from the main oil passage; the balance oil passage 17b is connected with a pressure reducing valve 19, and the pressure reducing valve 19 provides continuous and stable oil pressure for the balance oil passage 17b, wherein the oil pressure is normally maintained at 1bar; the pressure reducing valve 19 is connected with a one-way valve 22 and a second filter 20, the second filter 20 is connected with a second pressure source 23 and used for providing oil pressure for the balance oil path 17b, and the second pressure source 23 is from the hydraulic torque converter oil inlet oil path 17c or the hydraulic torque converter oil outlet oil path 17d or other lubricating oil paths; the check valve 22 is connected with the second oil pan 21; the first filter 16 and the second filter 20 are used for filtering the oil from the first pressure source 18 and the second pressure source 23, respectively, to ensure the cleanliness of the oil entering the blocked oil passage 17a and the balanced oil passage 17 b.

The working principle is as follows: under the working condition of torque conversion, the oil of the transmission enters the cavity of the torque converter from the oil inlet channel 17c of the hydraulic torque converter, takes away the heat generated in the hydraulic circular cavity and flows out from the oil outlet port 17 d. The balance oil passage 17b continuously maintains a stable pressure of 1bar during this process.

When the hydraulic torque converter reaches a coupling point, the lockup clutch starts to work, the proportional solenoid valve 14 provides oil pressure for the lockup oil passage 17a, the pressure of the lockup oil passage 17a starts to increase from zero, the pressure of the balance oil passage 17b is overcome, the execution piston 2g is pushed to axially move towards the direction of the transmission, the compression dual plate 5 and the friction plate 6 are abutted to the back plate 8b, friction force is generated, and torque is transmitted to the turbine assembly 9 through the spline plate 7 b. In the process, the oil from the oil inlet oil way 17c takes away heat generated by friction of the friction plate set, and flows out from the oil outlet 17d of the hydraulic torque converter.

When the lockup clutch is operated, the pressure of the balance oil passage 17b is known, and the pressure of the lockup oil passage 17a is controlled by the current of the proportional solenoid valve 14 and is also known. When the engine transmits a certain torque, the control unit controls the proportional solenoid valve 14 to provide corresponding pressure for the locking oil passage 17a according to the friction characteristic of the locking clutch; according to the fact that effective pressure acting on the dual plates 5 and the friction plates 6 is equal to the pressure of the locking oil path 17a minus the pressure of the balance oil path 17b, at the moment, the pressure of the locking oil path 17a is slightly smaller than actual required pressure, and therefore micro-sliding friction control of the locking clutch can be achieved.

When the locking working condition is converted into the torque conversion working condition, the locking oil path 17a discharges pressure oil to the first oil pan 15 through the proportional electromagnetic valve 14, the actuating piston 2g is reset under the pressure of the balance oil path 17b, the dual plate 5 and the friction plate 6 are not squeezed any more, and torque is transmitted to the turbine assembly 9 through the pump wheel assembly 12.

A speed changer is provided with the hydraulic oil circuit control system, can realize one-gear locking, and a locking clutch can be used as a starting device like a hydraulic circulation cavity, so that the hydraulic circulation cavity can be designed to be smaller and lighter, and the assembly space of the whole speed changer can be saved.

The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. The hydraulic torque converter is characterized by comprising a cover wheel assembly (2), a turbine assembly (9), a guide wheel assembly (11) and a pump wheel assembly (12) which are sequentially arranged on a transmission shaft;

the cover wheel assembly (2) comprises a cover wheel (2 f), and an execution piston (2 g) is arranged in the cover wheel (2 f); a clearance between the execution piston (2 g) and the cover wheel (2 f) forms an execution cavity (2 e), and the execution cavity (2 e) is connected with a locking oil path (17 a); a balance piston (2 j) is arranged in the execution piston (2 g), and a balance oil way (17 b) is connected with a gap between the balance piston (2 j) and the execution piston (2 g); the balance oil way (17 b) and the locking oil way (17 a) are communicated with the transmission shaft oil hole;

the pump wheel assembly (12), the guide wheel assembly (11) and the turbine assembly (9) jointly form a hydraulic circulating circle;

an oil inlet oil way (17 c) is arranged between the turbine assembly (9) and the guide wheel assembly (11), and the oil inlet oil way (17 c) is communicated with the hydraulic circulating circular cavity;

an oil outlet oil way (17 d) is arranged between the pump wheel assembly (12) and the guide wheel assembly (11), and the oil outlet oil way (17 d) is communicated with the hydraulic circulating circular cavity.

2. The hydraulic torque converter according to claim 1, characterized in that a dual plate (5), a friction plate (6), a spline plate assembly (7) and a back plate assembly (8) are sequentially arranged between the turbine assembly (9) and the cover wheel assembly (2), the spline plate assembly (7), the back plate assembly (8) and the pump wheel assembly (12) are sequentially and fixedly connected to the cover wheel assembly (2), the dual plate (5) is in splined connection with the spline plate assembly (7), and the dual plate (5) pushes the friction plate (6) to abut against the back plate assembly (8); the friction plate (6) is in splined connection with the turbine assembly (9); a first thrust bearing (3) is arranged between the turbine assembly (9) and the cover wheel assembly (2), and a first gasket (4) is arranged between the first thrust bearing (3) and the turbine assembly (9).

3. A hydrodynamic torque converter according to claim 2, characterized in that the spline disc assembly (7) comprises a first sealing ring (7 a) and a spline disc (7 b), the spline disc (7 b) being fixedly connected with the cover wheel (2 f), the first sealing ring (7 a) being arranged between the spline disc (7 b) and the cover wheel assembly (2);

the back plate assembly (8) comprises a second sealing ring (8 a), a back plate (8 b) and a third sealing ring (8 c), one side of the back plate (8 b) is fixedly connected with the spline disc assembly (7), and the other side of the back plate (8 b) is fixedly connected with the pump wheel assembly (12); the second sealing ring (8 a) is arranged between the back plate (8 b) and the spline disc assembly (7); the third sealing ring (8 c) is arranged between the back plate (8 b) and the pump wheel assembly (12).

4. Hydrodynamic torque converter according to claim 1, characterized in that a second thrust bearing (10) is arranged between the turbine assembly (9) and the stator assembly (11).

5. The hydraulic torque converter according to any one of claims 1-4, characterized in that a fourth sealing ring (2 i) is arranged between the inner wall of the outer circle of the actuating cavity (2 e) inside the cover wheel assembly (2) and the outer wall of the outer circle of the actuating piston (2 g), and a fifth sealing ring (2 h) is arranged between the cover wheel (2 f) and the inner wall of the inner circle of the actuating piston (2 g); and a sixth sealing ring (2 k) is arranged between the inner circle wall of the balance piston (2 j) and the cover wheel (2 f).

6. A hydraulic circuit control system comprising a torque converter according to any one of claims 1 to 5.

7. The hydraulic oil circuit control system according to claim 6, characterized in that the blocked oil circuit (17 a) is connected with an accumulator (13) and a proportional solenoid valve (14), and the proportional solenoid valve (14) is connected with a first oil pan (15) and a first filter (16); the filter (16) is connected to a first pressure source (18).

8. The hydraulic circuit control system according to claim 6 or 7, wherein a pressure reducing valve (19) is connected to the balancing circuit (17 b), a check valve (22) and a second filter (20) are connected to the pressure reducing valve (19), and a second pressure source (23) is connected to the second filter (20); the check valve (22) is connected with a second oil pan (21).

9. A transmission equipped with the torque converter according to any one of claims 1 to 5.

10. A transmission equipped with the hydraulic fluid passage control system according to any one of claims 6 to 8.

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