Motorcycle dynamometer

Abstract

The utility model provides a dynamometer for a motorcycle. The objective of the utility model is to solve the technical problem that the complexity of equipment and the production cost are increased due to the fact that a conventional motorcycle dynamometer directly detects the rotating speed and the torque of a roller to convert the size of simulated driving resistance. According to the technical scheme, the motorcycle dynamometer comprises a roller and an alternating-current variable-frequency motor, the alternating-current variable-frequency motor comprises a rotor, a stator and a shell fixedly connected with the stator. The rotor comprises a rotating shaft of which the two ends respectively penetrate out of the shell; two ends of the rotating shaft are rotationally connected with the bracket through bearings; the front end of the rotating shaft is coaxially and fixedly connected with the roller, and the rear end is connected with the speed measuring encoder; the shell is hinged to the upper end of the force transducer, and the lower end of the force transducer is hinged to the support. Simulated driving resistance is converted by detecting the rotating speed of the rotating shaft of the alternating-current variable-frequency motor and the counter-acting force borne by the shell, and the driving resistance testing device is more convenient and beneficial to simplifying the equipment structure and reducing the equipment cost.

Description

Technical Field

[0001] The utility model relates to the technical field of motorcycle detection and testing equipment, in particular to a motorcycle dynamometer. Background Art

[0002] When a motorcycle is tested as a whole vehicle, a motorcycle dynamometer is required. A motorcycle dynamometer can be used to simulate driving resistance. It is mainly composed of a roller and a motor that drives the roller. The driving resistance simulated by the motorcycle dynamometer depends on the speed and torque of the roller; therefore, during testing, the simulated driving resistance is often converted by detecting the speed and torque of the roller.

[0003] However, when testing a motorcycle, the driving wheel of the motorcycle needs to be supported by a roller, so the size of the roller is set to be larger, and the roller will continue to rotate during the test. In this case, it becomes very troublesome to directly detect the speed and torque of the roller, which will increase the complexity of the motorcycle dynamometer and further increase the equipment cost of the motorcycle dynamometer. Summary of the invention

[0004] The utility model aims to provide a motorcycle dynamometer, which detects the shaft speed of an AC variable frequency motor through a speed encoder to determine the rotation speed of a drum; and detects the reaction force exerted on the housing of the AC variable frequency motor through a force sensor to determine the torque of the drum; compared with directly detecting the rotation speed and torque of the drum, it is more convenient and is conducive to simplifying the equipment structure and reducing the equipment cost.

[0005] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0006] A motorcycle dynamometer comprises: a roller, an AC variable frequency motor driving the roller; the AC variable frequency motor comprises: a rotor, a stator matched with the rotor, and a shell fixedly connected to the stator; the rotor comprises: a rotating shaft with two ends respectively extending from the shell; the two ends of the rotating shaft are rotatably connected to a bracket through bearings; the front end of the rotating shaft is coaxially fixed to the roller, and the rear end is connected to a speed encoder; the shell is hinged to the upper end of a force sensor, and the lower end of the force sensor is hinged to the bracket; a vertical line L1 of the rotating shaft is drawn through the hinge point at the upper end of the force sensor; a straight line L2 is drawn through the hinge point at the upper end and the hinge point at the lower end of the force sensor; L1 and L2 are perpendicular to each other.

[0007] Optionally, the rear end of the rotating shaft is connected to the input shaft of the speed encoder through a flexible coupling; the speed encoder adopts an OMRON high-precision rotary encoder.

[0008] Optionally, the front end of the rotating shaft is coaxially fixed to the roller via a tightening sleeve.

[0009] Optionally, the force sensor adopts an HBM high-precision tension and pressure sensor.

[0010] Optionally, it also includes: a first connecting member; the first connecting member includes: a first substrate, two first wing plates extending upward from the first substrate; the two first wing plates are correspondingly provided with first mounting holes passing through front and back, and are adapted to first pin rods; the lower end of the force sensor is provided with a first connecting portion limited between the two first substrates, and the first connecting portion is provided with a first pin hole adapted to the first pin rod; the first substrate is fixedly connected to the bracket.

[0011] Optionally, the first wing plate is provided with a first opening extending from the first mounting hole to the right wall; the first wing plate is provided with a first through hole extending from the first opening to the upper wall, and a threaded hole extending downward from the first opening and adapted for a first bolt.

[0012] Optionally, it also includes: a second connecting member; the second connecting member includes: a second substrate, two second wing plates extending to the right from the second substrate; the two second wing plates are correspondingly provided with second mounting holes passing through front and back, and are adapted to second pin rods; the upper end of the force sensor is provided with a second connecting portion limited between the two second substrates, and the second connecting portion is provided with a second pin hole adapted to the second pin rod; the second substrate is fixedly connected to the casing of the AC variable frequency motor.

[0013] Optionally, the second wing plate is provided with a second opening extending from the second mounting hole to the upper wall; the second wing plate is provided with a second through hole extending from the second opening to the right wall, and a threaded hole extending to the left from the second opening and adapted for a second bolt.

[0014] Optionally, the bracket is equipped with an extension frame extending into the drum, the extension frame is equipped with a caliper, and a brake ring for cooperating with the caliper is provided along the inner wall of the drum.

[0015] Optionally, a loading plate is installed on the top of the bracket; the loading plate is provided with a notch at a position corresponding to the roller, so that the roller can support the driving wheel of the motorcycle.

[0016] The working principle of the utility model is as follows: let the two ends of the rotating shaft of the AC variable frequency motor pass through the shell respectively, install a roller at one end of the rotating shaft and install a speed encoder at the other end, so that the roller and the rotating shaft rotate synchronously, and the speed encoder detects the rotation speed of the rotating shaft to determine the rotation speed of the roller. When the stator applies force to the rotor, driving the rotor to rotate with the roller; the rotor will also apply a reaction force to the stator and transmit it to the shell where the stator is installed. The reaction force on the shell is detected by the force sensor; then based on the hinge point between the force sensor and the shell, the distance to the rotating shaft; and combined with the radius of the roller, the torque of the roller can be converted. Finally, combined with the rotation speed and torque of the roller, the size of the simulated driving resistance can be converted.

[0017] It can be seen that the beneficial effects of the utility model are: the rotation speed of the shaft of the AC variable frequency motor is detected by the speed encoder, thereby determining the rotation speed of the drum; and the reaction force on the casing of the AC variable frequency motor is detected by the force sensor, thereby determining the torque of the drum; compared with directly detecting the rotation speed and torque of the drum, it is more convenient and is conducive to simplifying the equipment structure and reducing equipment costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0019] Figure 1 It is a schematic diagram of the structure of the utility model;

[0020] Figure 2 A schematic diagram of the utility model for setting a roller;

[0021] Figure 3 for Figure 2 Enlarged view of part A in the middle;

[0022] Figure 4 This is a schematic diagram of setting a speed measuring encoder in the utility model.

[0023] Figure numerals: 1. roller; 2. housing; 3. bracket; 4. speed encoder; 5. force sensor; 6. flexible coupling; 7. first connecting member; 8. first substrate; 9. first wing plate; 10. first pin rod; 11. first connecting part; 12. first through hole; 13. second substrate; 14. second connecting part; 15. extension frame; 16. caliper; 17. brake ring; 18. loading plate. DETAILED DESCRIPTION

[0024] In the following, only some exemplary embodiments are briefly described. As those skilled in the art will appreciate, the described embodiments may be modified in various ways without departing from the spirit or scope of the present invention. Therefore, the drawings and descriptions are considered to be exemplary and non-restrictive in nature.

[0025] In the description of the present invention, it should be understood that the terms "front", "rear", "left", "right" and the like indicate directions or positional relationships based on the attached Figure 1 The orientation or positional relationship shown is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0026] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0027] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0028] The disclosure below provides many different embodiments or examples to implement different structures of the present invention. In order to simplify the disclosure of the present invention, the components and settings of specific examples are described below. Of course, they are only examples and are not intended to limit the present invention.

[0029] The following is combined with Figure 1 ~Attached Figure 4 The embodiments of the present utility model are described in detail.

[0030] The embodiment of the utility model provides a motorcycle dynamometer. The motorcycle dynamometer comprises: a drum 1, an AC variable frequency motor driving the drum 1. The AC variable frequency motor comprises: a rotor, a stator matched with the rotor, and a housing 2 fixedly connected with the stator. The rotor comprises: a rotating shaft with two ends respectively passing through the housing 2. The two ends of the rotating shaft are rotatably connected with the bracket 3 through bearings. The front end of the rotating shaft is coaxially fixed with the drum 1, and the rear end is connected with the speed encoder 4. The housing 2 is hinged to the upper end of the force sensor 5, and the lower end of the force sensor 5 is hinged to the bracket 3. A vertical line L1 of the rotating shaft is drawn through the hinge point at the upper end of the force sensor 5; a straight line L2 is drawn through the hinge point at the upper end and the hinge point at the lower end of the force sensor 5; L1 and L2 are perpendicular to each other. It should be understood that the motorcycle dynamometer is usually used in conjunction with a PLC controller, and parameters and formulas can be preset through the PLC controller to automatically convert the size of the simulated driving resistance according to the measured data. For detailed conversion formulas and methods, please refer to the transportation industry standard of the People's Republic of China JT / T 445-2021. This is the prior art and is not an innovative improvement of this application, so it will not be repeated here.

[0031] The specific implementation method of the utility model is described below: the two ends of the rotating shaft of the AC variable frequency motor are respectively passed through the shell, and the roller 1 is installed at one end of the rotating shaft and the speed encoder 4 is installed at the other end. In this way, the roller 1 rotates synchronously with the rotating shaft, and the speed encoder 4 detects the rotation speed of the rotating shaft to determine the rotation speed of the roller 1. When the stator applies force to the rotor, driving the rotor to rotate with the roller 1; the rotor will also apply a reaction force to the stator and transmit it to the shell 2 where the stator is installed. The reaction force on the shell 2 is detected by the force sensor 5; then based on the hinge point between the force sensor 5 and the shell 2, the distance to the rotating shaft; and combined with the radius of the roller 1, the torque of the roller 1 can be converted. Finally, combined with the rotation speed and torque of the roller 1, the size of the simulated driving resistance can be converted. The utility model detects the shaft speed of the AC variable frequency motor through a speed measuring encoder 4, thereby determining the speed of the drum 1; and detects the reaction force exerted on the housing 2 of the AC variable frequency motor through a force measuring sensor 5, thereby determining the torque of the drum 1; compared with directly detecting the speed and torque of the drum 1, the utility model is more convenient and is conducive to simplifying the equipment structure and reducing the equipment cost.

[0032] Furthermore, the rear end of the rotating shaft is connected to the input shaft of the speed encoder 4 through a flexible coupling 6; the speed encoder 4 adopts an OMRON high-precision rotary encoder. It should be understood that the rotation speed of the rotating shaft can be measured more accurately in this way.

[0033] Furthermore, the front end of the rotating shaft is coaxially fixed to the drum 1 via a tightening sleeve.

[0034] Furthermore, the force sensor 5 adopts an HBM high-precision tension and pressure sensor.

[0035] Furthermore, it also includes: a first connecting member 7; the first connecting member 7 includes: a first substrate 8, two first wing plates 9 extending upward from the first substrate 8; the two first wing plates 9 are correspondingly provided with first mounting holes passing through the front and back, and are adapted to the first pin rod 10; the lower end of the force sensor 5 is provided with a first connecting portion 11 limited between the two first substrates 8, and the first connecting portion 11 is provided with a first pin hole adapted to the first pin rod 10; the first substrate 8 is fixedly connected to the bracket 3.

[0036] Further, the first wing plate 9 is provided with a first opening extending from the first mounting hole to the right wall; the first wing plate 9 is provided with a first through hole 12 extending from the first opening to the upper wall, and a threaded hole extending downward from the first opening, and adapted to the first bolt. It should be understood that by loosening the first bolt, the first pin rod 10 can be inserted into or pulled out of the first mounting hole; by tightening the first bolt, the first pin rod 10 can be fixed to the first connecting member 7. Locking the first pin rod 10 to the first connecting member 7 can improve the test accuracy.

[0037] Furthermore, it also includes: a second connecting member; the second connecting member includes: a second substrate 13, two second wing plates extending to the right from the second substrate 13; the two second wing plates are correspondingly provided with second mounting holes passing through front and back, and are adapted to second pin rods; the upper end of the force sensor 5 is provided with a second connecting portion 14 limited between the two second substrates 13, and the second connecting portion 14 is provided with a second pin hole adapted to the second pin rod; the second substrate 13 is fixedly connected to the housing 2 of the AC variable frequency motor.

[0038] Further, the second wing plate is provided with a second opening extending from the second mounting hole to the upper wall; the second wing plate is provided with a second through hole extending from the second opening to the right wall, and a threaded hole extending to the left from the second opening, and adapted to the second bolt. It should be understood that by loosening the second bolt, the second pin can be inserted into or pulled out of the second mounting hole; by tightening the second bolt, the second pin can be fixed to the second connecting member. Locking the second pin in the second connecting member can improve the test accuracy.

[0039] Further, the bracket 3 is equipped with an extension frame 15 extending into the drum 1, and the extension frame 15 is equipped with a caliper 16. The drum 1 is provided with a brake ring 17 along the inner wall for cooperating with the caliper 16. It should be understood that when not detecting, the caliper 16 can be made to clamp the brake ring 17 of the drum 1 to limit the rotation of the drum 1 and achieve braking.

[0040] Furthermore, a loading plate 18 is installed on the top of the bracket 3; the loading plate 18 is provided with a notch at a position corresponding to the roller 1, so that the roller 1 can support the driving wheel of the motorcycle.

[0041] Although specific embodiments of the present invention are described above, those skilled in the art should understand that various changes or modifications may be made to these embodiments without departing from the principle and essence of the present invention, but these changes and modifications are all within the scope of protection of the present invention.

Claims

1. A motorcycle dynamometer, characterized in that: include: A drum (1), and an AC variable frequency motor for driving the drum (1); The AC variable frequency motor comprises: a rotor, a stator matched with the rotor, and a housing (2) fixedly connected to the stator; The rotor comprises: a rotating shaft with two ends extending from the housing (2); the two ends of the rotating shaft are rotatably connected to a bracket (3) via bearings; The front end of the rotating shaft is coaxially fixedly connected to the roller (1), and the rear end is connected to the speed measuring encoder (4); The housing (2) is hinged to the upper end of the force sensor (5), and the lower end of the force sensor (5) is hinged to the bracket (3); A perpendicular line L1 is drawn through the hinge point at the upper end of the force sensor (5) to the rotation axis; a straight line L2 is drawn through the hinge point at the upper end and the hinge point at the lower end of the force sensor (5); L1 and L2 are perpendicular to each other.

2. The motorcycle dynamometer according to claim 1, characterized in that: The rear end of the rotating shaft is connected to the input shaft of a speed measuring encoder (4) via a flexible coupling (6); the speed measuring encoder (4) adopts an OMRON high-precision rotary encoder.

3. The motorcycle dynamometer according to claim 1, characterized in that: The front end of the rotating shaft is coaxially fixedly connected to the roller (1) via a tightening sleeve.

4. The motorcycle dynamometer according to claim 1, characterized in that: The force sensor (5) adopts an HBM high-precision tension and pressure sensor.

5. The motorcycle dynamometer according to any one of claims 1 to 4, characterized in that: Also includes: A first connecting member (7); The first connecting member (7) comprises: a first base plate (8), and two first wing plates (9) extending upward from the first base plate (8); The two first wing plates (9) are respectively provided with first mounting holes extending through the front and rear and adapted to fit the first pin rods (10); The lower end of the force sensor (5) is provided with a first connecting portion (11) which is limited between the two first substrates (8), and the first connecting portion (11) is provided with a first pin hole adapted to the first pin rod (10); The first substrate (8) is fixedly connected to the bracket (3).

6. The motorcycle dynamometer according to claim 5, characterized in that: The first wing plate (9) is provided with a first opening extending from the first mounting hole to the right wall; The first wing plate (9) is provided with a first through hole (12) extending from the first opening to the upper wall, and a threaded hole extending downward from the first opening and adapted to fit a first bolt.

7. The motorcycle dynamometer according to any one of claims 1 to 4, characterized in that: Also includes: a second connecting member; The second connecting member comprises: a second base plate (13), and two second wing plates extending rightward from the second base plate (13); The two second wing plates are respectively provided with second mounting holes which penetrate front and back and are adapted to the second pin rods; The upper end of the force sensor (5) is provided with a second connecting portion (14) which is limited between the two second substrates (13); the second connecting portion (14) is provided with a second pin hole adapted to the second pin rod; The second substrate (13) is fixedly connected to the housing (2) of the AC variable frequency motor.

8. The motorcycle dynamometer according to claim 7, characterized in that: The second wing plate is provided with a second opening extending from the second mounting hole to the upper wall; The second wing plate is provided with a second through hole extending from the second opening to the right wall, and a threaded hole extending from the second opening to the left and adapted for a second bolt.

9. The motorcycle dynamometer according to any one of claims 1 to 4, characterized in that: The bracket (3) is equipped with an extension frame (15) extending into the drum (1); the extension frame (15) is equipped with a caliper (16); and a brake ring (17) for cooperating with the caliper (16) is provided along the inner wall of the drum (1).

10. The motorcycle dynamometer according to any one of claims 1 to 4, characterized in that: A loading plate (18) is installed on the top of the bracket (3); the loading plate (18) is provided with a notch at a position corresponding to the roller (1) so that the roller (1) can support the driving wheel of the motorcycle.

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