Hydraulic double-flow gain continuously variable transmission

Abstract

The utility model provides a hydraulic double-flow gain continuously variable transmission, and relates to the technical field of continuously variable transmission. A hydraulic double-flow gain continuously variable transmission comprises an original-speed hydraulic circuit and a flow gain hydraulic circuit, the original-speed hydraulic circuit sucks hydraulic oil from an oil tank through a positive displacement hydraulic pump and presses the hydraulic oil into a pressure-bearing pipeline, and the hydraulic oil directly flows to a second hydraulic motor through the pressure-bearing pipeline; according to the flow gain hydraulic circuit, on the basis of the original speed hydraulic circuit, hydraulic oil is sucked out of an oil tank through a positive displacement hydraulic pump, pressed into a pressure bearing pipeline and conveyed to a first hydraulic motor through the pressure bearing pipeline, and the hydraulic oil drives a gear set after passing through the first hydraulic motor, drives a hydraulic pump and is conveyed to a second hydraulic motor after passing through the hydraulic pump. A speed regulating valve is arranged between the first hydraulic motor and the hydraulic pump, the transmission ratio can be adjusted through the speed regulating valve, the structure is simple, faults are not prone to happening, all components are directly designed in the oil tank, and the problem that the oil tank leaks oil outwards can be solved.

Description

Technical Field

[0001] The present application relates to the technical field of continuously variable transmission, and in particular to a hydraulic dual-flow gain continuously variable transmission. Background Art

[0002] The transmission systems in the prior art are divided into: pure mechanical transmission systems and hydraulic transmission systems. Pure mechanical transmission systems mostly use bevel gears and adjust the transmission ratio by adjusting the position of the V-belt; hydraulic transmission systems mostly use variable actuator gears and adjust the transmission ratio by adjusting the gear diameter through hydraulic pressure.

[0003] Mechanical continuously variable transmission systems usually require more complex mechanical changes when adjusting the transmission ratio. For example, a transmission system consisting of a bevel gear and a steel belt and a gear with a variable diameter requires adjusting the position of the steel belt or the radius of the five-star gear, which affects the stability of the system when it is subjected to high torque.

[0004] However, some hydraulic transmission systems need to adjust the pressure in the oil, which usually causes oil leakage due to poor sealing, and traditional hydraulic systems cannot dynamically adjust the transmission ratio according to the load. Utility Model Content

[0005] The present application aims to solve at least one of the technical problems existing in the prior art. To this end, the present application proposes a hydraulic dual-flow gain continuously variable transmission, which aims to improve the problems that the existing continuously variable transmission system requires complex mechanical changes when using mechanical transmission, generates sealing when using hydraulic transmission, and cannot dynamically adjust the transmission ratio according to the load.

[0006] The present application proposes a hydraulic dual-flow gain continuously variable transmission, comprising: an original speed hydraulic circuit and a flow gain hydraulic circuit, wherein the original speed hydraulic circuit uses a positive displacement hydraulic pump to suck hydraulic oil out of a tank and pressurize it into a pressure-bearing pipeline, and the hydraulic oil flows directly to hydraulic motor 2 through the pressure-bearing pipeline; the flow gain hydraulic circuit is based on the original speed hydraulic circuit, in which a positive displacement hydraulic pump sucks hydraulic oil out of a tank and presses it into a pressure-bearing pipeline, and the hydraulic oil is transported to hydraulic motor 1 through the pressure-bearing pipeline, the hydraulic oil drives a gear set after passing through hydraulic motor 1, and drives a hydraulic pump, and is transported to hydraulic motor 2 after passing through the hydraulic pump, and the input and output oil flow ratio of the flow gain hydraulic circuit is not 1; a speed regulating valve is provided between hydraulic motor 1 and the hydraulic pump; the original speed hydraulic circuit is connected in parallel with the flow gain hydraulic circuit.

[0007] In addition, a hydraulic dual flow gain continuously variable transmission according to the above technical solution provided by the present application also has the following additional technical features:

[0008] In the above technical solution, a pressure gauge is additionally provided between the volumetric hydraulic pump and the speed regulating valve.

[0009] In the above technical solution, the pressure-bearing pipeline between the volumetric hydraulic pump and the hydraulic motor 1 is connected to a pressure-bearing pipeline in the same direction as the oil tank, and the pressure-bearing pipeline is connected to a relief valve.

[0010] In the above technical solution, a direct pressure-bearing pipeline is connected between the hydraulic motor 1 and the oil tank.

[0011] In the above technical solution, a direct pressure-bearing pipeline is connected between the hydraulic motor 1 and the hydraulic pump.

[0012] In the above technical solution, a pressure-bearing pipeline is connected between the hydraulic pump and the oil tank, and a one-way valve is connected to the pressure-bearing pipeline.

[0013] In the above technical solution, a pressure-bearing pipeline is further connected between the hydraulic pump and the second hydraulic motor, and a gate valve is connected to the pressure-bearing pipeline.

[0014] In the above technical solution, the transmission ratio of the gear set is greater than 1.

[0015] Compared with the prior art, this application has the following beneficial effects:

[0016] 1. The transmission ratio can be adjusted by the speed regulating valve, and the speed regulation can be completed by keeping the shapes of other components unchanged. The structure is simple and not prone to failure;

[0017] 2. All components in this application can be designed directly in the oil tank, and the hydraulic oil in the oil tank (outside the pipeline) is not pressurized, so the problem of oil leakage from the oil tank can be better avoided;

[0018] 3. This application can increase output torque and reduce power loss when running at low speed. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the implementation methods of the present application, the drawings required for use in the implementation methods will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 is an overall schematic diagram of a hydraulic dual-flow gain continuously variable transmission and all its oil circuits according to an embodiment of the present application;

[0021] Figure 2 is a schematic diagram of an original speed hydraulic circuit according to an embodiment of the present application;

[0022] Figure 3is a schematic diagram of a flow gain hydraulic circuit according to an embodiment of the present application;

[0023] Figure 4 is another schematic diagram of a flow gain hydraulic circuit according to an embodiment of the present application.

[0024] Icons: 1. Positive displacement hydraulic pump; 2. Pressure gauge; 3. Hydraulic motor one; 4. Speed ​​control valve; 5. Hydraulic pump; 6. Oil tank; 7. Overflow valve; 8. Gear set; 9. Check valve; 10. Gate valve; 11. Hydraulic motor two. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solutions and advantages of the implementation methods of this application clearer, the technical solutions in the implementation methods of this application will be clearly and completely described below in conjunction with the drawings in the implementation methods of this application. Obviously, the described implementation methods are part of the implementation methods of this application, not all of the implementation methods. Based on the implementation methods in this application, all other implementation methods obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0026] like Figure 1-Figure 4 As shown, a hydraulic dual flow gain continuously variable transmission according to an embodiment of the present application includes an original speed hydraulic circuit and a flow gain hydraulic circuit, and the original speed hydraulic circuit is connected in parallel with the flow gain hydraulic circuit.

[0027] Among them, Figure 1 and Figure 2 As shown, the original speed hydraulic circuit uses a positive displacement hydraulic pump 1 to suck hydraulic oil from an oil tank 6 and press it into a pressure-bearing pipeline, and then directly flows to a hydraulic motor 2 11 through the pressure-bearing pipeline.

[0028] like Figure 1-Figure 4 As shown, the flow gain hydraulic circuit is based on the original speed hydraulic circuit. The volumetric hydraulic pump 1 sucks the hydraulic oil from the oil tank 6 and presses it into the pressure pipeline. The hydraulic oil is transported to the hydraulic motor 3 through the pressure pipeline. The hydraulic oil drives the gear set 8 after passing through the hydraulic motor 3, and drives the hydraulic pump 5. The hydraulic oil is transported to the hydraulic motor 2 11 after passing through the hydraulic pump 5. The input and output oil flow ratio of the flow gain hydraulic circuit is not 1.

[0029] Specifically, a speed regulating valve 4 is provided between the hydraulic motor 3 and the hydraulic pump 5 .

[0030] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, the present application is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0031] like Figure 1 , Figure 3 and Figure 4As shown, the pressure pipeline between the volumetric hydraulic pump 1 and the hydraulic motor 3 is connected to a pressure pipeline of the same-direction oil tank 6, and the pressure pipeline is connected to a relief valve 7, which can ensure that the pressure in the entire circuit does not exceed the maximum pressure that the pipeline can withstand.

[0032] Furthermore, a pressure-bearing pipeline is connected between the hydraulic pump 5 and the oil tank 6, and a one-way valve 9 (such as Figure 1 , Figure 3 and Figure 4 shown).

[0033] It should be noted that, in the embodiment of the present application, the flow direction of the one-way valve 9 can and can only flow toward the oil tank 6 .

[0034] Furthermore, a pressure-bearing pipeline is connected between the hydraulic pump 5 and the hydraulic motor 2 11, and a gate valve 10 is connected to the pressure-bearing pipeline. The gate valve 10 can allow the pressure oil to flow directly back into the oil tank to achieve the function of the clutch.

[0035] It should be noted that the transmission ratio of the gear set 8 is greater than 1.

[0036] Embodiment 1: In the above embodiment, a direct pressure-bearing pipeline (such as Figure 3 When both the hydraulic motor 3 and the hydraulic pump 5 are positive displacement pumps, the oil circuit is Figure 3 shown.

[0037] Embodiment 2: In the above embodiment, a direct pressure-bearing pipeline (such as Figure 4 When both the hydraulic motor 3 and the hydraulic pump 5 are impeller pumps, the oil circuit is Figure 4 shown.

[0038] In a specific embodiment of the present application, during operation, torque is input into the volumetric hydraulic pump 1, and the volumetric hydraulic pump 1 sucks hydraulic oil from the oil tank 6 and presses it into the pressure-bearing pipeline. The pipeline is divided into two branches and flows to the hydraulic motor 2 11; when the speed control valve 4 is fully opened, since there is a load in the circuit where the hydraulic motor 1 3 is located, most of the oil will be directly delivered to the hydraulic motor 2 11 through the speed control valve 4. At this time, the speed of the hydraulic motor 2 11 is low and the torque is large; when the opening of the speed control valve 4 is reduced, the pressure of the oil circuit on its left side increases. Assuming that the volumetric hydraulic pump 1 can provide a constant flow of oil, the oil flowing through the hydraulic motor 1 3 will increase, and the speed of the hydraulic motor 1 3 will increase, so that the hydraulic pump 5 can obtain a higher speed after the gear set 8 changes speed, thereby providing more hydraulic flow to the hydraulic motor 2 11. At this time, due to the increase in the speed of the hydraulic pump 5, the high-speed and low-torque working state of the hydraulic motor 2 11 is achieved.

[0039] Specifically, because the transmission ratio of the gear set 8 is greater than 1, the flow rate of the oil flowing through the hydraulic pump 5 is greater than the flow rate flowing through the hydraulic motor 3, so this branch can achieve the effect of flow gain.

[0040] In the design of the present application, firstly, all the mechanisms can be designed directly in the oil tank 6. Since the oil in the oil tank 6 (outside the pipeline) is not pressurized, the problem of oil leakage from the oil tank 6 can be better avoided.

[0041] Secondly, when performing speed regulation and clutch operations, the present application only needs to adjust the valve openings of the speed regulating valve 4 and the gate valve 10, which is simple to operate and has a stable structure.

[0042] It should be noted that the specific models and specifications of the volumetric hydraulic pump 1, hydraulic motor 1 3, speed control valve 4, hydraulic pump 5, overflow valve 7, gear set 8, one-way valve 9, gate valve 10 and hydraulic motor 2 11 need to be selected and determined according to the actual specifications of the device, and the specific selection calculation method adopts the existing technology in the field, so it will not be described in detail.

[0043] The above are only preferred implementations of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A hydraulic dual flow gain continuously variable transmission, characterized in that: include: The original speed hydraulic circuit is a positive displacement hydraulic pump (1) that sucks hydraulic oil from an oil tank (6) and presses it into a pressure-bearing pipeline, and directly flows to a second hydraulic motor (11) through the pressure-bearing pipeline; A flow gain hydraulic circuit, wherein the flow gain hydraulic circuit is based on the original speed hydraulic circuit, wherein a positive displacement hydraulic pump (1) sucks hydraulic oil from an oil tank (6) and presses the oil into a pressure-bearing pipeline, and the oil is transported to a hydraulic motor 1 (3) through the pressure-bearing pipeline. The hydraulic oil drives a gear set (8) after passing through the hydraulic motor 1 (3), and drives a hydraulic pump (5), and is transported to a hydraulic motor 2 (11) after passing through the hydraulic pump (5). The ratio of the input and output oil flow of the flow gain hydraulic circuit is not 1; A speed regulating valve (4) is provided between the hydraulic motor 1 (3) and the hydraulic pump (5); The original speed hydraulic circuit is connected in parallel with the flow gain hydraulic circuit.

2. A hydraulic dual flow gain continuously variable transmission as claimed in claim 1, characterized in that: A pressure gauge (2) is additionally provided between the positive displacement hydraulic pump (1) and the speed regulating valve (4).

3. A hydraulic dual flow gain continuously variable transmission as claimed in claim 1, characterized in that: The pressure-bearing pipeline between the volumetric hydraulic pump (1) and the hydraulic motor 1 (3) is connected to a pressure-bearing pipeline in the same direction as the oil tank (6), and the pressure-bearing pipeline is connected to an overflow valve (7).

4. A hydraulic dual flow gain continuously variable transmission as claimed in claim 1, characterized in that: A direct pressure-bearing pipeline is connected between the hydraulic motor 1 (3) and the oil tank (6).

5. A hydraulic dual flow gain continuously variable transmission as claimed in claim 1, characterized in that: A direct pressure-bearing pipeline is connected between the hydraulic motor 1 (3) and the hydraulic pump (5).

6. A hydraulic dual flow gain continuously variable transmission as claimed in claim 1, characterized in that: A pressure-bearing pipeline is connected between the hydraulic pump (5) and the oil tank (6), and a one-way valve (9) is connected to the pressure-bearing pipeline.

7. A hydraulic dual flow gain continuously variable transmission as claimed in claim 1, characterized in that: A pressure-bearing pipeline is connected between the hydraulic pump (5) and the second hydraulic motor (11), and a gate valve (10) is connected to the pressure-bearing pipeline.

8. A hydraulic dual flow gain continuously variable transmission as claimed in claim 1, characterized in that: The transmission ratio of the gear set (8) is greater than 1.

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