A diesel engine hand and foot linkage throttle control mechanism based on electric cylinder

Abstract

The utility model relates to diesel engine throttle control technical field discloses a diesel engine hand foot linkage throttle control mechanism based on electric cylinder. The mechanism includes electric cylinder, flexible axle, first rocker arm, return spring rod group, pedal, second connecting rod, second rocker arm, first connecting rod and throttle, and electric cylinder drives first rocker arm through flexible axle, and then has the return spring rod group with axial telescopic freedom degree and connects second rocker arm, and pedal drives second rocker arm directly through second connecting rod, and second rocker arm converges two -way input and controls throttle through first connecting rod. The utility model utilizes the elastic telescopic characteristics of return spring rod group, solves the mechanical interference problem of electric cylinder position locking and foot pedal action, realizes the function that foot control independent control engine speed is realized under electric control constant speed, and has compact structure, automatic reset reliable and the advantages such as installation arrangement nimble.

Description

Technical Field

[0001] This utility model relates to the field of diesel engine throttle control technology, and in particular to a diesel engine hand-foot linkage throttle control mechanism based on an electric cylinder. Background Technology

[0002] In construction machinery, agricultural machinery, and special transport vehicles, the throttle control system of diesel engines typically needs to have two operating modes to adapt to different working conditions. One is a foot-operated control mode, where the driver adjusts the engine speed in real time by pressing the accelerator pedal, mainly used in scenarios with frequent load changes; the other is a manual or electronic speed control mode, used to stabilize the engine speed at a specific value, mainly to meet the needs of continuous and stable operations such as water pumping, power generation, and milling.

[0003] With the electrification of vehicle control technology, traditional mechanical throttle levers are gradually being replaced by electric cylinders, which offer higher control precision and are easier to remotely control. However, after introducing electric cylinders into the throttle control system, achieving an organic integration of electronic and foot control has become a technical challenge. This is because electric cylinders typically use lead screw drives, which have self-locking characteristics or exhibit rigid connections when power is off, leading to potential conflicts in the mechanical transmission between the electronic control path and the foot control path.

[0004] Specifically, when the system is in electronically controlled constant speed mode, the electric cylinder push rod extends and locks in a certain position, putting the throttle lever in a state of force balance. At this time, if the driver needs to temporarily reduce engine speed by pressing the foot pedal, because traditional transmission mechanisms are mostly rigid connections, the stationary electric cylinder will restrict further rotation of the throttle rocker arm, resulting in obstructed foot pedal action and inability to achieve overdrive control. This mechanical interference not only causes the "hand-foot linkage" function to fail, but in severe cases can even cause bending deformation of the connecting rod and overload damage to the motor. Furthermore, existing solutions are often complex in structure and bulky, making it difficult to achieve reliable reset and linkage within limited installation space.

[0005] Therefore, this utility model proposes a diesel engine hand-foot linkage throttle control mechanism based on an electric cylinder to overcome the shortcomings of the prior art. Utility Model Content

[0006] To overcome the above shortcomings, this utility model provides a diesel engine hand-foot linkage throttle control mechanism based on an electric cylinder, aiming to improve the problems of structural interference, poor operation, and inability to guarantee automatic recovery to the original set speed when combining the precise electronic setting of the hand throttle with the temporary mechanical intervention of the foot throttle in the diesel engine hand-foot linkage throttle control mechanism.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: a diesel engine hand-foot linkage throttle control mechanism based on an electric cylinder, comprising: an electric cylinder, a flexible shaft, a first rocker arm, a pedal, a second connecting rod, a second rocker arm, a first connecting rod and a throttle; and a return spring rod assembly.

[0008] The power output end of the electric cylinder is fixedly connected to the first end of the flexible shaft, and the end of the flexible shaft is connected to the input end of the first rocker arm; the output end of the first rocker arm is hinged to the first end of the return spring rod assembly, and the end of the return spring rod assembly is hinged to the first part of the second rocker arm; the output end of the pedal is hinged to the first end of the second connecting rod, and the end of the second connecting rod is hinged to the second part of the second rocker arm; the third part of the second rocker arm is hinged to the first end of the first connecting rod, and the end of the first connecting rod is connected to the throttle.

[0009] The electric cylinder, flexible shaft, first rocker arm, second rocker arm, pedal, and return spring rod assembly are combined through a specific series and parallel hybrid connection method. The return spring rod assembly is constructed as an elastic transmission component with axial extension and retraction degrees of freedom. It is configured to allow elastic deformation when the electric cylinder remains stationary so that the first rocker arm is fixed in position, allowing the second rocker arm to rotate around the axis with the pedal drive, and to release elastic potential energy to drive the mechanism to reset after the external force is removed.

[0010] Preferably, the return spring rod assembly includes a cylinder, a telescopic rod slidably inserted into the cylinder, and a return spring disposed inside the cylinder; the end of the cylinder away from the telescopic rod constitutes the first end of the return spring rod assembly, and the end of the telescopic rod extending out of the cylinder constitutes the last end of the return spring rod assembly; the return spring abuts against the inner wall of the cylinder and between the telescopic rod.

[0011] Preferably, the flexible shaft includes a flexible protective tube and a steel wire mandrel passing through the flexible protective tube; the flexible protective tube is fixed to the frame by a flexible shaft bracket, and the end of the steel wire mandrel extends out of the flexible protective tube and is rotatably connected to the input end of the first rocker arm by a ball head pin.

[0012] Preferably, the first rocker arm has an L-shaped crank arm structure, and the middle part of the first rocker arm is rotatably mounted on a fixed support through a first pin; the two ends of the first rocker arm are respectively connected to the flexible shaft and the return spring rod assembly.

[0013] Preferably, the second rocker arm is rotatably mounted on a fixed support via a second pin; the first part, the second part, and the third part of the second rocker arm are distributed at different lever arm positions of the second pin.

[0014] Preferably, both ends of the second connecting rod are provided with universal ball joints, and the second connecting rod is connected to the pedal and the second rocker arm respectively through the universal ball joints.

[0015] Preferably, the pedal includes a pedal bracket and a pedal arm rotatably connected to the pedal bracket, and the pedal output end is located below the rotation center of the pedal arm.

[0016] Preferably, the first connecting rod is a length-adjustable rigid tie rod, and an adjusting nut is provided in the middle of the first connecting rod body.

[0017] Preferably, the electric cylinder is vertically fixed, and the flexible shaft is arranged in a U-shape or S-shape.

[0018] This utility model has the following beneficial effects: 1. In this utility model, by setting a return spring rod assembly with axial extension and retraction freedom between the first rocker arm and the second rocker arm, the problem of existing hand-foot linkage mechanisms being unable to independently accelerate by foot pedal or being prone to mechanical interference in the electronically locked state is solved. This achieves the effect of deceleration by pressing the pedal and utilizing the extension and retraction deformation of the spring rod assembly when the electronic control maintains a fixed throttle opening. Moreover, it can automatically reset by utilizing the internal spring potential energy after releasing the pedal, significantly improving driving safety and handling flexibility.

[0019] 2. This utility model solves the problems of electric cylinders being susceptible to high temperature vibration and malfunctions when directly installed near the engine, as well as the difficulty in wiring due to limited installation space in the cab, by using an electric cylinder in conjunction with a flexible shaft as the electronic power transmission path. It achieves the technical effect of flexible and free arrangement of power source, easy routing around complex obstacles, and effective isolation of engine high temperature vibration, thereby extending the service life of electrical components. Attached Figure Description

[0020] Figure 1 This is a perspective view of a diesel engine hand-foot linked throttle control mechanism based on an electric cylinder proposed in this utility model; Figure 2 This is a schematic diagram of an electric cylinder for a diesel engine hand-foot linkage throttle control mechanism based on an electric cylinder, as proposed in this utility model. Figure 3 This is a schematic diagram of the foot pedal of a diesel engine hand-foot linkage throttle control mechanism based on an electric cylinder proposed in this utility model. Figure 4 This is a schematic diagram of the lever of a diesel engine hand-foot linkage throttle control mechanism based on an electric cylinder proposed in this utility model.

[0021] Legend: 1. Electric cylinder; 2. Flexible shaft; 3. First rocker arm; 4. Return spring rod assembly; 5. Pedal; 6. Second connecting rod; 7. Second rocker arm; 8. First connecting rod; 9. Throttle. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] Please refer to Figures 1 to 4 This utility model provides a diesel engine hand-foot linkage throttle control mechanism based on an electric cylinder, which aims to solve the structural defects of existing diesel engine throttle control systems, such as the incompatibility between electric control mode and mechanical foot control mode, the easy mechanical interference between the two, and the complex reset structure.

[0024] like Figure 1 and Figure 2 As shown, the diesel engine hand-foot linked throttle control mechanism based on an electric cylinder is an organic whole, mainly composed of an electronic control input component, a foot control input component, a core linkage component, and an output transmission component. Specifically, it includes a vertically arranged electric cylinder 1, a curved flexible shaft 2, a first rocker arm 3, a return spring rod group 4 with elastic telescopic function, a pedal 5, a second connecting rod 6, a second rocker arm 7, a first connecting rod 8, and an engine throttle 9. The electric cylinder 1 serves as the power source in electronic control mode, and its output push rod is fixedly connected to the head end of the flexible shaft 2. The flexible shaft 2 acts as... As a flexible transmission medium, its end away from the electric cylinder 1 extends downward and is connected to the power input end of the first rocker arm 3 by rotation or hinge. The flexible shaft 2 adapts to the installation space and transmits linear thrust by utilizing its flexibility. The first rocker arm 3 serves as an intermediate conversion component on the electronic control path. Its power output end is hinged to the first end of the return spring rod group 4 by a pin. The return spring rod group 4 serves as a key coupling component connecting the electronic control path and the confluence point. Its end is hinged to the first part of the second rocker arm 7, thereby establishing the first transmission path from the electric cylinder 1 to the second rocker arm 7.

[0025] Based on this, pedal 5 serves as the input end for foot control mode. The output end of pedal 5 is hinged to the first end of the second link 6 via a universal ball joint. The second link 6, as a direct mechanical transmission rod, has its end hinged to the second part of the second rocker arm 7 via a universal ball joint, thus establishing a second transmission path from pedal 5 to the second rocker arm 7. The second rocker arm 7, as the confluence hub of the two input paths, has its third part hinged to the first end of the first link 8. The end of the first link 8 is ultimately connected to the throttle 9, forming a unified output path. This layout allows the second rocker arm 7 to simultaneously or separately receive inputs from the return spring rod group 4 and the second rocker arm 7. The driving force of the two-link 6 is used to adjust the opening of the throttle 9 through the first link 8. The return spring rod assembly 4 is constructed as an elastic transmission component with axial extension and retraction freedom. Its specific structure includes a cylinder, a telescopic rod that slides through the cylinder, and a return spring set inside the cylinder. The cylinder and the telescopic rod constitute the first end and the second end of the return spring rod assembly 4, respectively, and are connected to the first rocker arm 3 and the second rocker arm 7. This structural design makes the return spring rod assembly 4 behave as a rigid link when transmitting thrust, and behave as an elastic component when it is necessary to absorb displacement difference, thereby effectively solving the interference problem of hand and foot linkage.

[0026] The return spring rod assembly 4 has a composite structure comprising a cylinder, a telescopic rod slidably inserted inside the cylinder, and a return spring disposed inside the cylinder. The return spring rod assembly 4 is disposed between the first rocker arm 3 and the second rocker arm 7. The first end of the cylinder away from the telescopic rod is hinged to the output end of the first rocker arm 3 by a pin, and the end of the telescopic rod extending out of the cylinder is hinged to the first part of the second rocker arm 7 by a pin. Its function is to act as a transmission link with variable length, transmitting rigid thrust in electric control mode and absorbing displacement difference through its own deformation in foot control mode.

[0027] Meanwhile, the return spring abuts against the inner wall of the cylinder and the telescopic rod. In the assembled state, the return spring is in a pre-tightened state to maintain the initial length of the return spring rod assembly 4. This internal spring engagement structure ensures that after the driver releases the pedal 5, the return spring rod assembly 4 can release elastic potential energy and drive the second rocker arm 7, the second connecting rod 6 and the pedal 5 to automatically return to the initial idle position.

[0028] Furthermore, regarding the configuration of the flexible shaft 2, the flexible shaft 2 includes a flexible protective tube and a steel wire spindle passing through the flexible protective tube. The flexible protective tube is fixedly installed on the frame or body by a flexible shaft bracket. The end of the steel wire spindle extends out of the flexible protective tube and is rotatably connected to the input end of the first rocker arm 3 by a ball head pin. This cooperative structure of the flexible protective tube and the steel wire spindle allows the electric cylinder 1 to be flexibly and vertically installed in a position away from the high temperature area of ​​the engine. The vertical thrust output by the electric cylinder 1 is converted into a horizontal swinging motion at the first rocker arm 3 by the flexible shaft 2, which is arranged in a U-shape or S-shape.

[0029] Regarding the installation structure of the second rocker arm 7, the second rocker arm 7 is rotatably mounted on a fixed support via a second pin. The first, second, and third parts of the second rocker arm 7 are distributed at different lever arm positions of the second pin, so that the return spring rod assembly 4 and the second connecting rod 6 can independently drive the second rocker arm 7 to rotate around the second pin. As for the adjustment structure of the first connecting rod 8, the first connecting rod 8 is constructed as a length-adjustable rigid tie rod. An adjusting nut is provided in the middle of the first connecting rod 8, which is used to adjust the connection distance between the second rocker arm 7 and the throttle 9 during the installation and debugging stage to ensure the initial accuracy of throttle control.

[0030] As a preferred embodiment, in order to improve the adaptability and flexibility of the first rocker arm 3 during installation, the first rocker arm 3 is constructed as an L-shaped crank arm structure. The middle part of the first rocker arm 3 is rotatably mounted on a fixed support or flexible shaft bracket through a first pin. The two ends of the first rocker arm 3 are respectively connected to the flexible shaft 2 and the return spring rod group 4. This L-shaped structure design can effectively convert the linear motion transmitted from the flexible shaft 2 into a rotational torque around the axis, thereby applying a push-pull action to the return spring rod group 4, optimizing the force transmission efficiency and spatial layout.

[0031] As a preferred embodiment, in order to compensate for the multidimensional angular deviation between the pedal 5 and the second rocker arm 7 during the movement and to prevent movement jamming, both ends of the second connecting rod 6 are provided with universal ball joints. The second connecting rod 6 is connected to the pedal 5 and the input arm of the second rocker arm 7 respectively through the universal ball joints at both ends. Utilizing the multi-degree-of-freedom rotation characteristics of the universal ball joints, it can automatically adapt to the angular error between the rotation plane of the pedal 5 around the pedal pivot and the rotation plane of the second rocker arm 7 around the second pin, ensuring smooth transmission.

[0032] As a preferred embodiment, in order to conform to ergonomics and provide a good operating feel, the pedal 5 consists of a pedal bracket and a pedal arm rotatably connected to the pedal bracket. The output end of the pedal 5 is designed to be located below the rotation center of the pedal arm. When the driver presses the pedal 5, the pedal 5 rotates around the pedal pivot, causing the output end located below to swing backward, thereby pushing the second linkage 6 to move backward. This lever design makes the pedal operation force moderate and the stroke control precise.

[0033] As a preferred embodiment, in order to facilitate the adjustment of the initial state of the mechanism in different vehicle models or installation environments, the first link 8 is designed as a length-adjustable rigid tie rod. An adjusting nut or threaded sleeve structure is provided in the middle of the first link 8. By rotating the adjusting nut, the effective length of the first link 8 can be changed, thereby precisely adjusting the connection distance between the second rocker arm 7 and the throttle 9, eliminating the installation gap and setting the idle speed opening of the throttle 9.

[0034] As a preferred embodiment, in order to further improve the reliability and lifespan of the flexible shaft 2, the flexible shaft 2 adopts a structure in which a flexible protective tube wraps around the steel wire mandrel. The flexible protective tube is fixed to the frame at multiple points by a dedicated flexible shaft bracket, which can effectively prevent the flexible shaft 2 from bending or jumping excessively when transmitting thrust, and ensure that the force transmission loss is minimized.

[0035] Working principle: In electronic control mode, the driver sends a command to the electric cylinder 1 by operating the electronic control knob on the cab panel. The rotation angle of the knob is converted into an electrical signal to directly control the extension and speed of the push rod of the electric cylinder 1. The electric cylinder 1 outputs linear thrust as a power source. This thrust is transmitted to the flexible shaft 2 connected to it. The flexible shaft 2 moves in the protective tube and drives the first rocker arm 3 to rotate around the first pin. The rotation of the first rocker arm 3 then pushes the return spring rod group 4, which is hinged to it, to make overall movement. At this time, the return spring rod group 4 acts as a rigid connecting rod to transmit force to the second rocker arm 7, driving the second rocker arm 7 to rotate around the second pin and pull the first connecting rod 8. Finally, the first connecting rod 8 pulls the engine throttle 9 to achieve precise electronic control of engine speed. In foot control mode, the driver presses the foot pedal 5 to decelerate and adjust the speed. The pedal 5 rotates around the pedal pivot, generating displacement, which is directly transmitted to the second rocker arm 7 via the second link 6. At this time, since the electric cylinder 1 is in a locked position, the first rocker arm 3 remains stationary. The second rocker arm 7 rotates around the second pivot under the direct drive of the second link 6. This rotation pulls the first link 8 to move, thereby controlling the opening of the engine throttle 9. On the other hand, it pulls the end of the return spring rod assembly 4, causing the telescopic rod of the return spring rod assembly 4 to move relative to the cylinder and compress or stretch the internal return spring. Thus, it adapts to the movement of the second rocker arm 7 through its own telescopic deformation, realizing independent superposition control of foot control and electric control. During the reset process, the return spring rod assembly 4 plays a crucial role in reset and linkage. When the driver releases the foot pedal 5, the reset spring inside the return spring rod assembly 4, which is compressed or stretched, releases its stored elastic potential energy. It uses the rebound force to pull the second rocker arm 7 back to its initial position, and then drives the second link 6 and the pedal 5 mechanism back to their initial stationary position through the linkage mechanism. At the same time, it ensures that the first link 8 resets, so that the throttle 9 can return to its initial opening.

Claims

1. A diesel engine hand-foot linked throttle control mechanism based on an electric cylinder, characterized in that, The system includes an electric cylinder (1), a flexible shaft (2), a first rocker arm (3), a return spring rod assembly (4), a pedal (5), a second connecting rod (6), a second rocker arm (7), a first connecting rod (8), and a throttle (9). The power output end of the electric cylinder (1) is fixedly connected to the head end of the flexible shaft (2), and the end end of the flexible shaft (2) is connected to the input end of the first rocker arm (3). The output end of the first rocker arm (3) is hinged to the head end of the return spring rod assembly (4), and the end end of the return spring rod assembly (4) is hinged to the first part of the second rocker arm (7). The output end of the pedal (5) is hinged to the head end of the second connecting rod (6). The second connecting rod (6) is hinged to the second part of the second rocker arm (7); the third part of the second rocker arm (7) is hinged to the first end of the first connecting rod (8); the end of the first connecting rod (8) is connected to the throttle (9); the return spring rod group (4) is constructed as an elastic transmission component with axial extension and retraction degree of freedom, configured to allow the second rocker arm (7) to rotate around the axis as driven by the pedal (5) when the electric cylinder (1) remains stationary so that the position of the first rocker arm (3) is fixed, and to release elastic potential energy to drive the mechanism to reset after the external force is removed.

2. The diesel engine hand-foot linked throttle control mechanism based on an electric cylinder according to claim 1, characterized in that, The return spring rod assembly (4) includes a cylinder, a telescopic rod slidably inserted inside the cylinder, and a return spring disposed inside the cylinder; the end of the cylinder away from the telescopic rod constitutes the head end of the return spring rod assembly (4), and the end of the telescopic rod extending out of the cylinder constitutes the tail end of the return spring rod assembly (4); the return spring abuts against the inner wall of the cylinder and the telescopic rod to maintain the initial length of the return spring rod assembly (4) and provide a return spring force.

3. The diesel engine hand-foot linked throttle control mechanism based on an electric cylinder according to claim 1, characterized in that, The flexible shaft (2) includes a flexible protective tube and a steel wire mandrel inserted inside the flexible protective tube; the flexible protective tube is fixed to the frame by a flexible shaft bracket, and the end of the steel wire mandrel extends out of the flexible protective tube and is rotatably connected to the input end of the first rocker arm (3) by a ball head pin.

4. The diesel engine hand-foot linked throttle control mechanism based on an electric cylinder according to claim 1, characterized in that, The first rocker arm (3) has an L-shaped crank arm structure. The middle part of the first rocker arm (3) is rotatably mounted on the fixed support through the first pin. The two ends of the first rocker arm (3) are respectively connected to the flexible shaft (2) and the return spring rod group (4), converting the linear motion of the flexible shaft (2) into a push-pull motion on the return spring rod group (4).

5. The diesel engine hand-foot linked throttle control mechanism based on an electric cylinder according to claim 1, characterized in that, The second rocker arm (7) is rotatably mounted on a fixed support via a second pin; the first part, the second part and the third part of the second rocker arm (7) are distributed at different lever arm positions of the second pin, so that the return spring rod group (4) and the second connecting rod (6) can independently drive the second rocker arm (7) to rotate around the second pin.

6. The diesel engine hand-foot linked throttle control mechanism based on an electric cylinder according to claim 1, characterized in that, The second link (6) is provided with universal ball joints at both ends. The second link (6) is connected to the pedal (5) and the second rocker arm (7) respectively through the universal ball joints to compensate for the angular deviation between the pedal (5) and the second rocker arm (7) on the plane of motion.

7. The diesel engine hand-foot linked throttle control mechanism based on an electric cylinder according to claim 1, characterized in that, The pedal (5) includes a pedal bracket and a pedal arm rotatably connected to the pedal bracket. The output end of the pedal (5) is located below the rotation center of the pedal arm. When the pedal (5) is pressed, the output end of the pedal (5) pushes the second connecting rod (6) to move backward.

8. The diesel engine hand-foot linked throttle control mechanism based on an electric cylinder according to claim 1, characterized in that, The first connecting rod (8) is constructed as a length-adjustable rigid tie rod. An adjusting nut is provided in the middle of the first connecting rod (8) to adjust the connection distance between the second rocker arm (7) and the throttle (9).

9. The diesel engine hand-foot linked throttle control mechanism based on an electric cylinder according to claim 1, characterized in that, The electric cylinder (1) is vertically fixed, and the flexible shaft (2) is arranged in a U-shape or S-shape to convert the vertical thrust of the electric cylinder (1) into the horizontal thrust at the first rocker arm (3).

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