CN105258944B - A test bench for a movable tooth continuously variable transmission and its start-up control method - Google Patents

Abstract

A kind of test-bed of movable-tooth stepless speed transmission is related to movable-tooth stepless speed transmission technical field.It includes engine, torque and speed sensorses, the first electromagnetic clutch, movable-tooth stepless speed transmission, the second electromagnetic clutch, dynamometer machine, and each part of the above is connected by shaft coupling between any two；Motor is connected to an input shaft of movable-tooth stepless speed transmission by shaft coupling, and controller is respectively coupled to engine and motor.The starting stage that on the one hand motor runs in movable-tooth stepless speed transmission, the rotating speed matched with driving wheel is provided to driven pulley, so that driven pulley has the centrifugal force for being enough to throw away slide plate in the starting stage, completion oscillating tooth is engaged with tooth profile metal chain, the problem of fundamentally the solution movable-tooth stepless speed transmission starting stage skids；On the other hand the hybrid electric drive system of engine and motor is constituted as power drive unit.Whole pilot system perfect in shape and function, characteristics of compact layout, testing scheme are simple, it is easy to control and realization.

Description

A test bench for a movable tooth continuously variable transmission and its start-up control method

technical field

The invention relates to a test technology of a movable-tooth continuously variable transmission, in particular to a test bench for system performance research and optimization of a movable-tooth continuously variable transmission.

Background technique

Gear transmission is a widely used transmission mechanism in the mechanical field, but this mechanism has high manufacturing precision and installation precision, and its transmission ratio is fixed, so it cannot realize stepless speed change. With the rapid development of science and technology, continuously variable transmission is widely used in the automobile industry as an ideal transmission. Patent 200580039668.6 (slide deformed teeth stepless meshing movable gear, authorized announcement date: June 10, 2009, authorized announcement number: CN 100498006C) introduces a sliding plate deformed movable teeth stepless meshed movable gear device, movable teeth The continuously variable transmission device is a new type of continuously variable transmission based on the theory of movable tooth meshing. This movable tooth continuously variable transmission is a non-friction deformation movable tooth continuously variable transmission device. The friction/traction transmission mode breaks through the inherent power/efficiency barrier of continuously variable transmission, and can realize high-power and high-efficiency transmission of power.

But this traditional sliding vane deformation movable tooth CVT also has a big defect, that is, when the centrifugal force is not enough to make the sliding vane of the driven wheel throw out at the starting stage, the slipping phenomenon of the metal toothed chain and the driven wheel will occur. Chain slippage will cause wear between the chain and the driven wheel, reduce the service life of the device, and cause the device to fail to start in severe cases.

Contents of the invention

Patent 200580039668.6 proposes a movable-tooth continuously variable transmission device, but the device has a slipping problem at the start stage. In order to solve this problem, the present invention designs a test bench for a movable-tooth continuously variable transmission. The designed transmission system can It fundamentally solves the start-up problem of the movable-tooth continuously variable transmission; in addition, this bench can realize the experimental research of the hybrid power system of the engine and the motor and the experimental research of the performance of the movable-tooth continuously variable transmission. Therefore, the present invention proposes a functional and compact system performance test bench aimed at the starting problem and performance test of the movable tooth continuously variable transmission.

A test bench for a movable-tooth continuously variable transmission, characterized in that it sequentially includes an engine 1, a rotational speed torque sensor 3, a first electromagnetic clutch 4, a movable-tooth continuously variable transmission 5, a second electromagnetic clutch 6, and a dynamometer 7 , The above components are connected in pairs by couplings.

In addition, the motor 8 is connected to an input shaft of the movable tooth continuously variable transmission 5 through a shaft coupling, and the controller 9 is connected to the engine 1 and the motor 8 respectively.

Wherein the movable tooth continuously variable transmission 5 comprises two input shafts, an output shaft and a pair of movable gears; the two input shafts are respectively: what is connected with the first electromagnetic clutch 4 is the driving shaft input shaft of the movable tooth continuously variable transmission 5; What is connected with the motor is the driven shaft input shaft of the movable tooth continuously variable transmission.

The method of applying the test bench is characterized in that: before the movable gear CVT is running, the first electromagnetic clutch is engaged, and the second electromagnetic clutch is disconnected, so that the transmission system is in an unloaded state; when the engine is running, simultaneously control The motor speed provides the speed for the driven wheel of the movable tooth continuously variable transmission. The motor speed increases from zero until the driven wheel slide can be thrown out of the movable tooth groove under the action of centrifugal force and meshed with the sprocket of the metal toothed chain. When the driven wheel After the meshing is stable, the second electromagnetic clutch is engaged to make the transmission system output power.

The test bench of the movable-tooth continuously variable transmission proposed by the present invention includes main components such as an engine, a motor, a rotational speed torque sensor, an electromagnetic clutch, a dynamometer, and a movable-tooth continuously variable transmission. Among them, the rotational speed torque sensor is installed between the engine and the input shaft of the driving wheel of the movable tooth continuously variable transmission, the electromagnetic clutch is installed between the engine and the movable tooth continuously variable transmission and between the movable tooth continuously variable transmission and the dynamometer, the motor and the movable tooth continuously variable transmission The input end of the driven shaft of the toothed continuously variable transmission is connected, the output shaft of the driven wheel of the movable tooth continuously variable transmission is connected with the dynamometer, and the components are connected through couplings.

In the test bench of the movable-tooth continuously variable transmission designed by the present invention, the motor is used as a starting motor on the one hand, that is, in the starting stage of the movable-tooth continuously variable transmission, it provides the driven wheel with a speed that matches the driving wheel, so that the driven wheel In the starting stage, it has enough centrifugal force to make the sliding plate throw out, complete the meshing of the movable tooth and the metal toothed chain, and fundamentally solve the problem of slipping in the starting stage of the movable tooth CVT; on the other hand, it is used as a power drive device to form the engine and Electric motors for hybrid drive systems.

In summary, the present invention has the following characteristics: the present invention proposes a test bench for a movable-tooth continuously variable transmission and a start-up control method thereof. The smooth start and reduce the wear between the metal toothed chain and the bevel wheel, prolong the service life of the device; the invention realizes a test bench of the hybrid power system, the movable tooth continuously variable transmission can be used as the power coupler of the hybrid power system, The power coupler can output high torque while realizing stepless speed regulation, and has the advantages of gear transmission and friction transmission continuously variable transmission.

Description of drawings

Figure 1 is a schematic diagram of the structure and composition of the movable tooth continuously variable transmission test bench.

in:

1. Engine 2. Coupling

3. Speed torque sensor 4. The first electromagnetic clutch

5. Movable tooth continuously variable transmission 6. The second electromagnetic clutch

7. Dynamometer 8. Motor

9. Controller

detailed description

An embodiment of the present invention is shown in FIG. 1 .

The test bench of the movable tooth continuously variable transmission designed by the present invention mainly includes an engine, a rotational speed torque sensor, an electromagnetic clutch, a shaft coupling, a movable tooth continuously variable transmission, a dynamometer, a motor and a controller. The engine is connected to the input shaft of the driving wheel of the movable tooth continuously variable transmission through the first electromagnetic clutch, and a speed torque sensor is arranged between the engine and the first electromagnetic clutch, and the output shaft of the movable tooth continuously variable transmission and the dynamometer The motor is connected with the input shaft of the driven wheel of the movable tooth continuously variable transmission, and the engine and the motor are controlled by the controller.

On the basis of the test bench, the present invention proposes a start-up control method of the movable-tooth continuously variable transmission, that is, before the movable-tooth continuously variable transmission operates, the first electromagnetic clutch is engaged and the second electromagnetic clutch is disconnected, so that the transmission system In the no-load state, when the engine is running, at the same time, the motor is controlled to provide a certain speed for the driven wheel of the movable tooth continuously variable transmission, so that the sliding plate of the driven wheel can be thrown out of the movable tooth groove and connected with the metal toothed chain under the action of centrifugal force. The meshing of the chain teeth is completed, so as to solve the slipping problem between the metal toothed chain and the driven wheel during the starting process, and the speed provided by the motor to the driven wheel should be the minimum speed required to make the driven wheel slide out, that is, the motor output The speed should increase gradually, and the motor can no longer provide speed when the driven wheel slides are fully engaged. When the meshing of the driven wheels is stable and the torque can be output smoothly, the second electromagnetic clutch is engaged to make the transmission system output power.

In addition, the present invention solves the problem of slippage between the driven wheel and the metal toothed chain during the start-up process by driving the motor to provide a certain speed for the driven wheel of the movable-tooth continuously variable transmission. system, the movable gear CVT is used as a variable speed ratio power coupler to couple the power of the engine and the motor, and the motor can still be used as a driving device to provide power for the system after the operation is stable.

Claims (1)

1. A test bench start-up control method of a movable tooth continuously variable transmission, characterized in that: the test bench comprises an engine, a rotating speed torque sensor, a first electromagnetic clutch, a movable tooth continuously variable transmission, a second electromagnetic clutch, Dynamometer, the above components are connected by couplings; In addition, the motor is connected to an input shaft of the movable tooth continuously variable transmission through a coupling, and the controller is connected to the engine and the motor respectively; The movable-tooth continuously variable transmission includes two input shafts, an output shaft and a pair of movable gears; the two input shafts are respectively: the drive shaft input shaft of the movable-tooth continuously variable transmission connected with the first electromagnetic clutch; connected with the motor The one is the driven shaft input shaft of the movable tooth continuously variable transmission; Before the movable tooth CVT is running, the first electromagnetic clutch is engaged and the second electromagnetic clutch is disconnected, so that the transmission system is in the no-load state; when the engine is running, the motor speed is controlled at the same time to provide the speed for the driven wheel of the movable tooth CVT , the motor speed increases from zero until the driven wheel slider can throw out the movable tooth groove under the action of centrifugal force and complete meshing with the sprockets of the metal toothed chain. When the driven wheel meshes stably, engage the second electromagnetic clutch to make the transmission system output power.