CN107131181A - Integrated hydraulic speed changer based on energy regenerating - Google Patents

Abstract

The invention discloses a kind of integrated hydraulic speed changer based on energy regenerating.Including novel hydraulic speed-changer, adjustable throttle valve, hydraulic accumulator and hydraulic oil container, novel hydraulic speed-changer has two fluid mouthful, input shaft and output shaft, input shaft between output shaft pass through hydraulic structure transmission drive, a fluid mouthful for novel hydraulic speed-changer is connected through adjustable throttle valve and hydraulic accumulator, and another fluid mouthful of novel hydraulic speed-changer is connected with hydraulic oil container.The system can realize deceleration and raising speed function, and the deceleration or acceleration of output end are realized by the charge and discharge of accumulator energy.Compared with traditional Hydrodynamic transmission, this device can not only realize speed-regulating function, moreover it is possible to by the energy regenerating of braking, being used during for accelerating, improving the utilization rate of energy.

Description

Integrated hydraulic transmission based on energy recovery

technical field

The invention relates to a hydrostatic transmission device, in particular to an integrated hydraulic transmission based on energy recovery.

Background technique

The traditional gear transmission has the disadvantages of large volume and high quality. At the same time, the acceleration and deceleration of the output end are coupled with the engine, and the engine cannot work at a high efficiency point. However, the device can decouple the engine from the output end, and convert mechanical energy into hydraulic energy when the output end is at low speed, and store it in the accumulator. When the system needs to accelerate, the hydraulic energy stored in the accumulator can be converted into mechanical energy, thus realizing the reuse of braking energy.

Contents of the invention

Aiming at the above-mentioned problems in the technology, the present invention proposes an integrated hydraulic transmission based on energy recovery, which can realize speed-up and speed-down functions, and realize deceleration and acceleration at the output end by charging and discharging the energy of the accumulator. Compared with the traditional hydraulic transmission, this device can not only realize the speed regulation function, but also recover the braking energy for use during acceleration, which improves the utilization rate of energy.

The technical scheme adopted in the present invention is:

The invention includes a novel hydraulic transmission, an adjustable throttle valve, a hydraulic accumulator and a hydraulic oil tank. The novel hydraulic transmission has two oil ports, an input shaft and an output shaft, and the transmission between the input shaft and the output shaft is driven by a hydraulic structure. One oil port of the new hydraulic transmission is connected with a hydraulic accumulator through an adjustable throttle valve, and the other oil port of the new hydraulic transmission is connected with a hydraulic oil tank.

The novel hydraulic transmission adopts a double-acting vane pump with an additional output shaft and a floating stator connected to the output shaft.

The double-acting vane pump originally had a stator and a rotor, the stator was fixed and not connected to the shaft, and the rotor was rotated and connected to the shaft. The present invention improves the double-acting vane pump. The difference of the improvement is that the output shaft is set so that the stator floats and connected to the output shaft.

Although the above-mentioned improvements have been made, the novel hydraulic transmission realizes the conversion between mechanical transmission and oil hydraulic pressure, and it is essentially a hydraulic transmission rather than a hydraulic pump.

The speed difference at both ends of the novel hydraulic transmission and the outflow flow of the oil port of the output flow have the following relationship:

Q＝D(ω _i -ω _o )＝D·Δω

Where Q is the flow rate at the pressure control end, D is the displacement of the new hydraulic transmission, ω _i is the speed of the input shaft, ω _o is the speed of the output shaft, and Δω is the difference between the input and output speeds.

The output torque of the novel hydraulic transmission and the pressure of the oil port of the output flow have the following relationship:

T=D·p

Where T is the torque of the output shaft, D is the displacement of the new hydraulic transmission, and p is the pressure at the control end.

The pressure difference at both ends of the adjustable throttle valve and the flow through the adjustable throttle valve have the following relationship:

Among them, Q is the passing flow rate, C _d is the flow coefficient of the oil, A is the flow area of the adjustable throttle valve, p is the pressure difference between the inlet and outlet of the throttle valve, and ρ is the oil density.

The pressure of the hydraulic accumulator and the flow through the hydraulic accumulator have the following relationship:

Among them, Q is the passing flow, p ₀ is the pre-charge pressure of the hydraulic accumulator, v ₀ is the volume of the hydraulic accumulator, and p ₁ is the pressure of the hydraulic accumulator.

The beneficial effects of the present invention are:

Different from the traditional hydraulic transmission, the novel hydraulic transmission of the present invention adjusts the flow of the input and output accumulators by controlling the opening of the throttle valve, so as to realize the function of speed regulation.

The use of the accumulator of the present invention can store the energy during deceleration and braking and reuse it. Therefore, the device can not only realize the functions of acceleration and deceleration, but also can store the energy during deceleration for use during acceleration, thereby improving the utilization rate of energy.

Description of drawings

Fig. 1 is a schematic diagram of the integrated hydraulic transmission of the present invention.

Figure 2 is a schematic diagram of the equivalent structure of the new hydraulic transmission.

Fig. 3 is an application embodiment of the present invention.

Fig. 4 is another application embodiment of the present invention.

In the figure: 1. Input shaft, 2. New hydraulic transmission, 3. Adjustable throttle valve, 4. Hydraulic accumulator, 5. Output shaft, 6. Hydraulic oil tank, 7. Final reducer, 8. Wheels, 9 , fan, 10, hydraulic pump, 11, hydraulic motor.

detailed description

The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

As shown in Figure 1, the present invention includes a novel hydraulic transmission 2, an adjustable throttle valve 3, a hydraulic accumulator 4 and a hydraulic oil tank 6, and the novel hydraulic transmission 2 has two oil ports, an input shaft 1 and an output shaft 5, The transmission between the input shaft 1 and the output shaft 5 is driven by a hydraulic structure. One oil port of the new hydraulic transmission 2 is connected to the hydraulic accumulator 4 through the adjustable throttle valve 3, and the other oil port of the new hydraulic transmission 2 is connected to the hydraulic accumulator 4. Hydraulic oil tank 6 connections.

The speed regulation of the input shaft 1 and the output shaft 5 is realized through the conversion of the oil inflow and outflow of the two oil ports in the new hydraulic transmission 2, specifically: when the oil flows from the hydraulic oil tank 6 through the new hydraulic transmission 2, adjustable throttle After the flow valve 3 flows into the hydraulic accumulator 4, the hydraulic accumulator 4 is charged with stored energy to realize the deceleration from the input shaft 1 to the output shaft 5; when the oil flows from the hydraulic accumulator 4 through the adjustable throttle valve 3. After the new hydraulic transmission 2 flows into the hydraulic oil tank 6, the hydraulic accumulator 4 is released to realize the speed increase from the input shaft 1 to the output shaft 5.

The newly implemented hydraulic transmission 2 adopts a double-acting vane pump, and an oil port and an output shaft are added to the double-acting vane pump, and the stator is set as a non-fixed floating, and then connected to the output shaft 5 . The improved double-acting vane pump is equivalent to the series structure of the hydraulic pump 10 and the hydraulic motor 11. As shown in Figure 2, when decelerating, most of the output flow of the hydraulic pump 10 flows out, and a small part flows into the hydraulic motor 11; Most of the output flow of the pump 10 flows into the hydraulic motor 11, and a small part flows out.

Embodiments of the present invention and its implementation work process are as follows:

Example 1

Fig. 3 is an application example of the present invention, which is applied in the transmission system of a vehicle. Wherein the input shaft is connected with the engine 7, and the output shaft is connected with the vehicle final drive 8. When the vehicle is running normally, the throttle valve 3 is closed, the final reducer 2 becomes a mechanical transmission, and the input shaft 1 and the output shaft 5 rotate at the same speed. When the vehicle decelerates and brakes, the engine speed can remain unchanged and still work in a relatively high efficiency range; at this time, by adjusting the opening of the throttle valve 3, a part of the input mechanical energy is stored in the hydraulic accumulator 4. When the vehicle accelerates, if the output speed is higher than the input speed, the opening of the throttle valve 3 is adjusted at this time, and the hydraulic energy of the hydraulic accumulator 4 is converted into mechanical energy through the hydraulic transmission 2 . The engine works in a higher efficiency range through energy storage and reuse.

Example 2

Fig. 4 is another application example of the present invention, which is applied to the fan cooling system of construction machinery. Wherein the input shaft is connected with the engine 7, and the output shaft is connected with the construction machinery cooling fan 8. When construction machinery is working, it is necessary to adjust the speed of the cooling fan in real time according to different working conditions. In order to make the engine work in a higher efficiency range, when the required speed of the fan is low, part of the engine output energy drives the fan, and part of it adjusts the opening of the throttle valve 3 and stores it in the hydraulic accumulator 4 . When the required speed of the fan increases, part of the energy required by the fan is provided by the engine; at the same time, the energy of the hydraulic accumulator 4 is released through the adjustment of the opening of the throttle valve 3, and converted into mechanical energy for driving the fan.

Claims (6)

1. An integrated hydraulic transmission based on energy recovery, characterized in that it includes a new hydraulic transmission (2), an adjustable throttle valve (3), a hydraulic accumulator (4) and a hydraulic oil tank (6), a new hydraulic The transmission (2) has two oil ports, an input shaft (1) and an output shaft (5). The transmission between the input shaft (1) and the output shaft (5) is driven by a hydraulic structure. One of the new hydraulic transmissions (2) The oil port is connected with the hydraulic accumulator (4) through the adjustable throttle valve (3), and the other oil port of the novel hydraulic transmission (2) is connected with the hydraulic oil tank (6). 2. An integrated hydraulic transmission based on energy recovery according to claim 1, characterized in that: the new hydraulic transmission (2) adopts a double output shaft, floating stator and connected to the output shaft (5). Acting vane pump. 3. The integrated hydraulic transmission based on energy recovery according to claim 1, characterized in that: the conversion of the oil inflow and outflow of the two oil ports in the new hydraulic transmission (2) and the pressure of the control oil port Variation realizes the speed regulation to output shaft (5). 4. An integrated hydraulic transmission based on energy recovery according to claim 3, characterized in that: when the oil from the hydraulic oil tank (6) passes through the new hydraulic transmission (2), the adjustable throttle valve (3) After it flows into the hydraulic accumulator (4), the hydraulic accumulator (4) is charged with stored energy to realize the deceleration from the input shaft (1) to the output shaft (5); When the oil flows from the hydraulic accumulator (4) through the adjustable throttle valve (3) and the new hydraulic transmission (2) into the hydraulic oil tank (6), the hydraulic accumulator (4) is released to realize the input shaft (1) Acceleration to output shaft (5). 5. An integrated hydraulic transmission based on energy recovery according to claim 1, characterized in that: the rotational speed difference at both ends of the novel hydraulic transmission (2) and the outflow flow rate of the oil port of the output flow have the following relationship : Q＝D(ω _i -ω _o )＝D·△ω Where Q is the flow rate at the pressure control end, D is the displacement of the new hydraulic transmission (2), ω _i is the speed of the input shaft (1), ω _o is the speed of the output shaft (5), and △ω is the difference between input and output speeds. 6. The integrated hydraulic transmission based on energy recovery according to claim 1, characterized in that: the output torque of the novel hydraulic transmission (2) and the pressure of the oil port of the output flow have the following relationship: T=D·p Where T is the torque of the output shaft (5), D is the displacement of the new hydraulic transmission (2), and p is the pressure at the pressure control end.