A pedal device for vehicle brake detection

Abstract

The present invention relates to the field of braking force detection equipment, and discloses a pedal device for vehicle braking detection, comprising a cab, a brake pedal, a fixed frame fixed in the cab, and a telescopic device movably arranged on the fixed frame; a pedal is hinged at the extended end of the telescopic rod of the telescopic device, and the pedal rests on the brake pedal; at least one supporting member is fixedly connected to the fixed frame. The pedal device for vehicle braking detection simulates a human foot stepping on the brake pedal, reduces the labor intensity of operators, and the applied pedal force is continuous, linear, and stable.

Description

Technical Field

[0001] The invention relates to the field of braking force detection equipment, in particular to a pedal device for vehicle braking detection. Background Art

[0002] With the development of the automobile industry and the improvement of national income levels, cars have entered the homes of ordinary people. Due to the needs of the target audience, the public has higher and higher requirements for automobile safety and various performance requirements for automobiles, especially braking performance. Service braking should ensure that the driver can control the motor vehicle to decelerate and stop safely and effectively during driving. It can be seen that vehicle braking performance is an important condition to ensure the safe driving of the vehicle. Therefore, vehicle braking inspection is a necessary process for the whole vehicle to leave the factory, and regular inspection is also required during the use of the vehicle. The national standard GB 7258-2017 "Technical Conditions for Motor Vehicle Operation Safety" stipulates that "the pedal force or hand grip force of the service brake when producing maximum braking efficiency should be less than or equal to: passenger cars and three-wheeled motorcycles: 500N; motorcycles (except three-wheeled motorcycles): 350N; other motor vehicles: 700N."

[0003] At present, in vehicle manufacturing plants and social testing lines (stations), flat-plate brake test benches and roller brake test benches are mostly used for braking force testing. During the test, the operator manually steps on the brake pedal according to the signal prompt (display or sound), and the force sensor of the test bench can detect the braking force of each wheel of the vehicle and other braking performance parameters. The time and force of manually stepping on the brake pedal are greatly affected by human factors and are unstable, especially in the oil brake type light trucks and micro trucks with relatively weak braking performance, and in the annual inspection of social testing lines. There are certain deviations in the results of braking force testing by different operators. Summary of the invention

[0004] The present invention aims to provide a pedal device for vehicle brake detection to solve the technical problem in the prior art that a brake pedal needs to be manually stepped on and the operation is unstable.

[0005] The technical solution adopted by the present invention is: it includes a cab and a brake pedal, also includes a fixed frame fixed in the cab, and a telescopic device movably arranged on the fixed frame; the extended end of the telescopic rod of the telescopic device is hinged with a pedal, and the pedal rests on the brake pedal; at least one support member is fixedly connected to the fixed frame.

[0006] Furthermore, the fixing frame is a rectangular frame, and the telescopic device is arranged in the rectangular frame.

[0007] Furthermore, double fork arms are hinged on both side frames of the rectangular frame, and a support member is fixedly connected to the intersection of the double fork arms.

[0008] Furthermore, the support member includes a sleeve, a screw rod inserted into the sleeve and threadedly connected to the sleeve; a locking nut is threadedly connected to the screw rod near the sleeve; and one end of the support member is fixedly connected to a fixing frame.

[0009] Furthermore, an adjustment support is provided at the bottom of the fixing frame, and a screw rod is provided at the top of the adjustment support, and the screw rod is threadedly connected to the fixing frame.

[0010] Furthermore, a clamping joint is provided between the telescopic rod of the telescopic device and the pedal, and a limit pin is fixed on the clamping joint; an oblong hole adapted to the limit pin is opened on the pedal, and the oblong hole is arc-shaped, and the center of the arc is on the same side as the clamping joint.

[0011] Furthermore, it comprises a controller; a pressure sensor is fixedly provided on a side of the pedal opposite to the clamping joint, and the pressure sensor and the telescopic device are electrically connected to the controller.

[0012] Furthermore, an output device is included, and the output device is a display connected to the pressure sensor and / or the controller.

[0013] Furthermore, the telescopic device is a hydraulic cylinder or a pneumatic cylinder, and the pressure medium inlet and outlet of the hydraulic cylinder or the pneumatic cylinder are connected to a solenoid valve through a pipeline, and the solenoid valve is electrically connected to a controller.

[0014] Furthermore, the telescopic device is an electric cylinder.

[0015] The beneficial effects of the present invention are as follows: the pedaling device for vehicle brake detection simulates a person's foot stepping on the brake pedal, and the pedaling force applied is continuous, linear, and stable. The device replaces the operator stepping on the brake pedal to work, reducing the operator's labor intensity, and working stably and efficiently. The influence of subjective factors when the operator steps on the brake pedal is eliminated, and the brake detection can be completed once, and the detected brake performance parameters are accurate and effective with low errors. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 Schematic diagram of the structure of a preferred embodiment of the present invention (control part is not shown);

[0017] Figure 2 It is a schematic diagram of the basic control principle (the arrow indicates the direction of signal transmission);

[0018] Figure 3 yes Figure 1 Structural schematic diagram of the middle support member (partial);

[0019] Figure 4 yes Figure 1 Node diagram of the hinge of the middle pedal;

[0020] Figure 5 Figure 1 Application effect diagram (control part is not drawn);

[0021] In the figure: 1. sleeve, 2. locking nut, 3. screw, 4. fixing frame, 5. clamp, 6. telescopic device, 7. clamp joint, 8. double wishbone, 9. pedal, 10. pressure sensor, 11. limit pin, 12. adjustment support. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings.

[0023] like Figure 1 , Figure 5 As shown, the present invention provides a pedal device for vehicle brake detection, including a cab and a brake pedal, and also includes a fixed frame 4 fixed in the cab, and a telescopic device 6 movably arranged on the fixed frame 4; the extended end of the telescopic rod of the telescopic device 6 is hinged with a pedal 9, and the pedal 9 rests on the brake pedal; at least one support member is fixedly connected to the fixed frame 4.

[0024] The fixing frame 4 is a rectangular frame, and the telescopic device 6 is arranged in the rectangular frame. The telescopic device 6 is usually a hydraulic cylinder, a pneumatic cylinder or an electric cylinder. A clamp 5 is sleeved on the outer shell of the hydraulic cylinder, the pneumatic cylinder or the electric cylinder, and the clamp 5 is arranged crosswise with the rectangular frame and fastened with bolts. The clamp 5 can rotate within a certain range. In addition, bolt holes can be directly drilled on the opposite sides of the outer shell of the hydraulic cylinder, the pneumatic cylinder or the electric cylinder, and two opposite bolts are passed through the bolt holes on the two side frames of the rectangular frame, so that the hydraulic cylinder, the pneumatic cylinder or the electric cylinder can be rotatably arranged in the rectangular frame.

[0025] In addition, double fork arms 8 are hinged on both side frames of the rectangular frame, and a support member is fixedly connected to the intersection of the double fork arms 8. Figure 3 As shown, the support member includes a sleeve 1, a screw rod 3 inserted into the sleeve 1 and threadedly connected to the sleeve 1; a locking nut 2 is threadedly connected to the screw rod 3 near the sleeve 1; one end of the support member is fixedly connected to a fixing frame 4; the other end of the support member abuts against the inner wall of the cab, and a pad is provided at the end. The sleeve 1 or the screw rod 3 is screwed to adjust the telescopic length of the support member so that it abuts against the inner wall of the cab. At this time, the locking nut 2 is tightened to prevent the screw rod 3 from loosening, thereby stabilizing the fixing frame 4. The support member can be adjusted in the length range of 300-600mm, and is suitable for large and small cabs.

[0026] The top of the fixing frame 4 is also vertically fixed with the above-mentioned support member, and the high end of the support member is pressed against the top of the cab. The bottom of the fixing frame 4 is provided with an adjustment support 12, and the top of the adjustment support 12 has a screw rod, which is screwed to the fixing frame 4. The adjustment support 12 is rotated to adjust the adjustment support 12 to press against the bottom of the cab. The adjustment support 12 can be adjusted in the height range of 40-65mm.

[0027] A clamping joint 7 is provided between the telescopic rod of the telescopic device 6 and the pedal 9. One end of the clamping joint 7 is fixedly connected to the telescopic rod of the telescopic device 6, and the other end is hinged to the pedal 9. A limit pin 11 is fixed on the clamping joint 7; the pedal 9 is provided with an oblong hole adapted to the limit pin 11, and the oblong hole is arc-shaped, and the center of the arc is on the same side as the clamping joint 7. The limit pin 11 slides in the oblong hole, and the corresponding pedal 9 can rotate within a certain range (usually ±30°), thereby improving the coordination between the pedal 9 and the brake pedal. At the same time, a clamping claw is fixedly connected to the side of the pedal 9 opposite to the clamping joint 7, and the clamping claw is used to clamp the brake pedal to prevent the pedal 9 from slipping when the brake pedal is stepped on. Figure 4 shown.

[0028] It should be noted that the support member can also be fixedly arranged on the two side frames of the rectangular frame, and the support member extends to both sides and presses against the two sides of the cab, that is, the door.

[0029] like Figure 2 As shown, the pedal device for vehicle brake detection also includes a controller, and the main control unit of the controller is 80C51; a pressure sensor 10 is fixedly arranged on the side of the pedal 9 opposite to the clamp joint 7, and the pressure sensor 10 and the telescopic device 6 are electrically connected to the controller. The pressure sensor 10 is divided into a plurality of types such as a piezoresistive pressure sensor 10, a ceramic pressure sensor 10, a diffused silicon pressure sensor 10, and an electric pressure sensor 10, which can be selected at will. In addition, the pressure sensor 10 is a non-standard product, as long as it meets the verification procedures in the JJG 860-2015 standard.

[0030] The pedal device for vehicle brake detection also includes an output device, which is a display connected to the pressure sensor 10 and / or the controller. When the telescopic device 6 is a hydraulic cylinder or a pneumatic cylinder, the pressure medium inlet and outlet of the hydraulic cylinder or the pneumatic cylinder are connected to a solenoid valve through a pipeline, and the solenoid valve is electrically connected to the controller. When the telescopic device 6 is an electric cylinder, the electric cylinder is directly connected to the controller. Of course, the controller is also connected to the above-mentioned pressure sensor 10, and the controller is also connected to the brake detection equipment of the flat brake test bench or the drum brake test bench.

[0031] Below, the pneumatic cylinder is taken as an example to illustrate the connection relationship between the controller and the solenoid valve. The air inlet and outlet of the pneumatic cylinder are connected in parallel with an exhaust solenoid valve and an intake solenoid valve through pipelines. The other end of the intake solenoid valve is connected to the factory gas circuit, and the other end of the exhaust solenoid valve is connected to the atmosphere. The exhaust solenoid valve and the intake solenoid valve are both connected to the controller. In addition, the above-mentioned exhaust solenoid valve and intake solenoid valve can be replaced by a multi-position multi-way solenoid valve, such as a three-position three-way solenoid valve.

[0032] When the controller receives the brake pedal stepping signal from the brake detection device, the controller sends an electrical signal to the intake solenoid valve to open it, while keeping the exhaust solenoid valve closed. The piston rod automatically extends under the action of air pressure, simulating a person stepping on the brake pedal. As the piston rod extends, the pedal 9 presses down the brake pedal, and the pressure sensor 10 detects the pedal force from time to time, and displays it on the display, and at the same time feeds back to the controller for calculation, and compares it with the brake pedal force in the national standard (recorded in the background technology). If the pedal force is less than the standard value, the intake solenoid valve passage is maintained, and the piston rod continues to extend and step on the brake pedal; when the pedal force reaches the standard or reaches the preset value, the intake solenoid valve is closed to maintain the current stepping action. When the controller receives the signal of releasing the brake pedal transmitted by the brake detection device, the controller sends an electrical signal to the exhaust solenoid valve to open it, while keeping the intake solenoid valve closed. The piston rod is reset under the action of the return spring, and the pedal 9 releases pressure to release the brake pedal. The pedal force is displayed in real time during the whole process, which is convenient for manual observation and monitoring.

[0033] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structure, equivalent process transformation made by using the contents of the description and drawings of the present invention, or direct or indirect application in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A pedal device for vehicle brake detection, comprising a cab and a brake pedal, characterized in that: It also includes a fixing frame fixed in the cab, and a telescopic device movably arranged on the fixing frame; a pedal is hingedly connected to the outwardly extending end of the telescopic rod of the telescopic device, and the pedal abuts against the brake pedal; a support member is fixedly connected to the fixing frame; The fixing frame is a rectangular frame, and the telescopic device is arranged in the rectangular frame. Double forks are hinged on the two side frames of the rectangular frame, and a support member is fixedly connected to the intersection of the double forks. One end of the support member is fixedly connected to the fixing frame through the double fork arm; the other end is against the inner wall of the cab, and a pad is provided at the end; a support member is also vertically fixed on the top of the fixing frame, and an adjustment support is provided at the bottom of the fixing frame. The top of the adjustment support has a screw rod, which is threadedly connected to the fixing frame, and the support member includes a sleeve, a screw rod inserted in the sleeve and threadedly connected to the sleeve; a locking nut is threadedly connected to the screw rod near the sleeve.

2. The pedal device for vehicle brake detection according to claim 1, characterized in that: A clamping joint is arranged between the telescopic rod of the telescopic device and the pedal board, and a limit pin is fixed on the clamping joint; an oblong hole adapted to the limit pin is opened on the pedal board, and the oblong hole is in an arc shape, and the center of the arc is on the same side as the clamping joint.

3. The pedal device for vehicle brake detection according to any one of claims 1-2, characterized in that: It comprises a controller; a pressure sensor is fixedly arranged on a side of the pedal opposite to the clamping joint, and the pressure sensor and the telescopic device are electrically connected with the controller.

4. The pedal device for vehicle brake detection according to claim 3, characterized in that: An output device is included, which is a display connected to the pressure sensor and / or the controller.

5. The pedal device for vehicle brake detection according to claim 4, characterized in that: The telescopic device is a hydraulic cylinder or a pneumatic cylinder, and the pressure medium inlet and outlet of the hydraulic cylinder or the pneumatic cylinder are connected to a solenoid valve through a pipeline, and the solenoid valve is electrically connected to a controller.

6. The pedal device for vehicle brake detection according to claim 4, characterized in that: The telescopic device is an electric cylinder.

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