Horizontal yawing base for test benches

Abstract

The utility model relates to test base technical field especially relates to be used for horizontal swing base of test board, including fixed base and movable base, the top of fixed base with movable base bottom plane is pasted, the front end middle of movable base is connected with fixed base rotation through a vertical shaft, the tail end of movable base is provided with the adjustment mechanism that can drive it rotates around the vertical shaft. The utility model discloses movable base is connected with fixed base through the vertical shaft, can rotate in the horizontal plane, thereby can pass through the adjustment movable base and adjust the pointing angle of the motor output shaft installed on it, in addition, adjustment mechanism adopts the worm and gear drive of big transmission ratio + gear drive, thereby obtains enough big transmission ratio, thereby makes movable base swing angle adjustment have very high precision.

Description

Technical Field

[0001] This utility model relates to the field of test base technology, and in particular to a horizontal swing base for a test bench. Background Technology

[0002] For the operational testing of the reducers and electronic controls of new energy vehicles, high-speed motor drives are required. This is because high-speed rotation amplifies structural defects. If the structure or its connection accuracy is insufficient, such as insufficient shaft accuracy, vibration will be aggravated during high-speed rotation, and the shaft may even break. Therefore, the operational testing of the reducers and electronic controls of new energy vehicles requires very high installation accuracy of the test bench, especially the test base.

[0003] Existing motor mounting bases, after motor installation, cannot adjust the horizontal yaw angle of the high-speed motor's output shaft in the horizontal plane. When connected to a reducer via a drive shaft, coupling, or power shaft, the connection distance is typically close to two meters, amplifying initial small deviations and causing the coaxiality accuracy between the shaft end and the reducer to fail to meet requirements. A common solution in this situation is to use a universal drive shaft. This connection method is suitable for low-speed motor test benches, but for high-speed motors, such as those operating at 20,000 rpm, it will cause significant vibration and inaccurate test data acquisition.

[0004] Therefore, this invention aims to provide a base that can be precisely adjusted to the axial angle of the motor on which it is mounted, so that the coaxiality and other precision requirements can be met when the motor and reducer are rigidly connected. Utility Model Content

[0005] The purpose of this utility model is to address the shortcomings of the existing technology by providing a horizontal oscillation base for a test bench. One end of the base is connected to a fixing device via a rotating shaft, and the other end is adjusted via a screw mechanism, thereby achieving a slight angular deflection of the base in the horizontal plane.

[0006] The technical solution adopted by this utility model to solve its technical problem is as follows: a horizontal sway base for a test bench, comprising a fixed base and a movable base, wherein the top of the fixed base is in contact with the bottom plane of the movable base, the front end of the movable base is rotatably connected to the fixed base via a vertical shaft, and the rear end of the movable base is provided with an adjustment mechanism that can drive it to rotate around the vertical shaft; the adjustment mechanism includes a mounting bracket fixed to the fixed base and a large gear fixed to the movable base, the large gear being coaxial with the vertical shaft, the mounting bracket being rotatably connected to a horizontal drive shaft and a vertical transition shaft, the drive shaft being coaxially fixed with a worm gear, and the transition shaft being coaxially fixed with a worm wheel and a small gear, the worm wheel meshing with the worm gear, and the small gear meshing with the large gear.

[0007] Preferably, the mounting bracket is provided with a locking device to prevent the drive shaft from rotating. The locking device includes a fixing block fixed to the mounting bracket. A semi-circular groove is provided on one side of the fixing block. The semi-circular groove is coaxial with the drive shaft and has the same radius. A clamping block is fixed to the fixing block by screws. The clamping block is provided with a clamping groove coaxial with the drive shaft. The central angle corresponding to the clamping groove is less than 180°. The radius of the clamping groove is greater than the radius of the drive shaft. A friction pad with a high coefficient of friction is pasted on the inner wall of the clamping groove. The radius of the arc-shaped wall formed by the friction pad after being pasted on the clamping groove is smaller than the radius of the drive shaft.

[0008] Preferably, a self-locking mechanism is formed between the worm wheel and the worm. That is, the helix angle of the worm is smaller than the friction angle at the contact between the worm wheel and the worm, so that only the worm can drive the worm wheel to rotate, but the worm wheel cannot drive the worm to rotate.

[0009] Preferably, the fixed base has at least four threaded holes, and the movable base has a corresponding arc-shaped elongated hole. The center of the arc-shaped elongated hole is on the axis of the vertical shaft. A bolt is threaded into each threaded hole, passing through the arc-shaped elongated hole, with its nut pressing downwards against the movable base. This arrangement is used to lock and fix the movable base and the fixed base after the motor shaft's offset angle has been adjusted using the adjustment mechanism, reducing vibration of the movable base during operation and preventing the movable base from shifting.

[0010] Preferably, the adjustment mechanism adjusts the horizontal swing angle of the movable base within a range of ±3°. That is, the horizontal swing range of the movable base is based on the longitudinal plane of the fixed base from front to back, which includes the vertical axis, and can swing 3° to the left or right.

[0011] Preferably, the large gear consists of only one section of arc-shaped teeth, and the large gear is fixed to the tail end of the movable base by a pin, which is interference-fitted with both the large gear and the movable base.

[0012] Preferably, a handwheel is fixed to one end of the drive shaft.

[0013] Preferably, the mounting bracket is equipped with an angle sensor to detect the rotation angle of the movable base.

[0014] The beneficial effects of this utility model are: 1. The movable base is connected to the fixed base through a vertical shaft and can rotate in the horizontal plane, so the pointing angle of the motor output shaft mounted on it can be adjusted by adjusting the movable base; 2. The adjustment mechanism adopts a worm gear transmission with a large transmission ratio + gear transmission, so as to obtain a sufficiently large transmission ratio, thereby making the adjustment of the sway angle of the movable base highly accurate; 3. The worm gear can achieve self-locking, thereby preventing the adjustment mechanism from rotating when the motor vibrates at high frequency. Attached Figure Description

[0015] Figure 1 This is a perspective view of the horizontal oscillation base for the test bench according to this utility model; Figure 2 yes Figure 1 Enlarged view of A in the middle; Figure 3 This is a front view of the horizontal oscillation base for the test bench according to this utility model; Figure 4 yes Figure 3 Top view; Figure 5 yes Figure 4 AA sectional view.

[0016] Explanation of reference numerals in the attached figures: 1 – Fixed base, 2 – Movable base, 3 – Vertical shaft, 4 – Adjustment mechanism, 41 – Mounting bracket, 42 – Drive shaft, 43 – Transition shaft, 44 – Worm gear, 45 – Worm wheel, 46 – Large gear, 47 – Small gear, 48 – Handwheel, 5 – Locking device, 51 – Fixed block, 52 – Semicircular groove, 53 – Clamping block, 54 – Clamping groove, 55 – Friction pad, 56 – Screw, 6 – Angle sensor. Detailed Implementation

[0017] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments, but this is not intended to limit the scope of the present invention.

[0018] like Figures 1-5As shown, the horizontal oscillation base for the test bench in this embodiment includes a fixed base 1 and a movable base 2. The top of the fixed base 1 is in contact with the bottom plane of the movable base 2. The front end of the movable base 2 is rotatably connected to the fixed base 1 via a vertical shaft 3. The rear end of the movable base 2 is provided with an adjustment mechanism 4 that can drive it to rotate around the vertical shaft 3. The adjustment mechanism 4 includes a mounting bracket 41 fixed to the fixed base 1 and a large gear 46 fixed to the movable base 2. The large gear 46 is coaxial with the vertical shaft 3. The mounting bracket 41 is rotatably connected to a horizontal drive shaft 42 and a vertical transition shaft 43. A worm gear 44 is coaxially fixed to the drive shaft 42. A worm wheel 45 and a small gear 47 are coaxially fixed to the transition shaft 43. The worm wheel 45 meshes with the worm gear 44, and the small gear 47 meshes with the large gear 46.

[0019] In this embodiment, the vertical shaft 3 is interference-fitted with the fixed base 1 and reinforced by a pin. Then, the movable base 2 is rotatably connected to the vertical shaft 3 through a bearing. After connection, the bottom surface of the movable base 2 abuts against the top surface of the fixed base 1. These two surfaces need to be flat with a certain degree of flatness so that the movable base 2 can slide around the vertical shaft 3 on the fixed base 1.

[0020] A handwheel 48 is fixed to the end of the drive shaft 42. Rotating the handwheel 48 drives the worm gear 44 to rotate, which in turn drives the worm wheel 45 to rotate. Since the pinion 47 and the worm wheel 45 are coaxially fixed on the same shaft, the pinion 47 also rotates, which in turn drives the large gear 46 meshing with it to rotate, that is, drives the movable base 2 to rotate around the vertical axis 3. Rotating the handwheel 48 clockwise or counterclockwise drives the movable base 2 to swing to the left or right, respectively.

[0021] In this embodiment, the transmission ratio of the worm gear is very large, and the transmission ratio between the pinion 47 and the gear 46 is also very large. Multiplying the two together, a sufficiently large transmission ratio can be obtained. In this way, whether the drive shaft 42 is driven by the handwheel 48 or by the motor, the sway angle of the movable base 2 can be controlled very precisely.

[0022] When adjusting the sway of the movable base 2 using the adjustment mechanism 4, in addition to setting a coaxiality detection device at the motor shaft for real-time adjustment, an angle sensor for detecting the rotation angle of the movable base 2 can also be set on the mounting frame 41 to collect data for future adjustments and references.

[0023] To prevent the adjustment mechanism 4 from rotating on its own due to high-frequency vibration, a self-locking mechanism is formed between the worm gear 45 and the worm 44. Simultaneously, the mounting bracket 41 is equipped with a locking device 5 to prevent the drive shaft 42 from rotating. The locking device 5 includes a fixing block 51 fixed to the mounting bracket 41. A semi-circular groove 52 is provided on one side of the fixing block 51. The semi-circular groove 52 is coaxial with the drive shaft 42 and has the same radius, meaning the drive shaft 42 abuts against the semi-circular groove 52 and can rotate. A clamping block 53 is fixed to the fixing block 51 by screws 56. The clamping block 53 has a clamping groove 54 coaxial with the drive shaft 42. The central angle of the clamping groove 54 is less than 180°, and the radius of the clamping groove 54 is greater than the radius of the drive shaft 42. A friction pad 55 with a high coefficient of friction is adhered to the inner wall of the clamping groove 54. The radius of the arc-shaped wall formed by the friction pad 55 after being adhered to the clamping groove 54 is smaller than the radius of the drive shaft 42.

[0024] Because the radius of the arc-shaped wall formed by the friction pad 55 after being attached to the clamping groove 54 is smaller than the radius of the drive shaft 42, there is a gap between the clamping block 53 and the fixing block 51. Therefore, when the clamping block 53 is fixed to the fixing block 51 by the screw 56, the clamping block 53 can hold the drive shaft 42 tightly and prevent it from rotating by the friction pad 55.

[0025] The working principle of the locking device 5 is as follows: when adjustment is required, the screw 56 is loosened; after the adjustment is completed, the screw 56 is tightened so that the friction pad 55 abuts against the drive shaft 42, thereby locking the drive shaft 42 and preventing it from rotating.

[0026] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model, and for the convenience of describing the technical solution, the front, back, left, right, top, middle, and bottom orientations are based on the accompanying drawings and are not a limitation on the protection scope of this utility model. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the essence and scope of the technical solution of this utility model.

Claims

1. A horizontal yaw base for a test bench, characterized in that: The device includes a fixed base and a movable base. The top of the fixed base is flush with the bottom plane of the movable base. The front end of the movable base is rotatably connected to the fixed base via a vertical shaft. The rear end of the movable base is provided with an adjustment mechanism that can drive it to rotate around the vertical shaft. The adjustment mechanism includes a mounting bracket fixed to the fixed base and a large gear fixed to the movable base. The large gear is coaxial with the vertical shaft. The mounting bracket is rotatably connected to a horizontal drive shaft and a vertical transition shaft. A worm gear is coaxially fixed to the drive shaft, and a worm wheel and a small gear are coaxially fixed to the transition shaft. The worm wheel meshes with the worm gear, and the small gear meshes with the large gear.

2. A horizontal yaw base for a test bed according to claim 1, characterised in that: The mounting bracket is equipped with a locking device to prevent the drive shaft from rotating. The locking device includes a fixing block fixed to the mounting bracket. A semi-circular groove is provided on one side of the fixing block. The semi-circular groove is coaxial with the drive shaft and has the same radius. A clamping block is fixed to the fixing block by screws. The clamping block is provided with a clamping groove coaxial with the drive shaft. The central angle corresponding to the clamping groove is less than 180°. The radius of the clamping groove is larger than the radius of the drive shaft. A friction pad with a high coefficient of friction is attached to the inner wall of the clamping groove. The radius of the arc-shaped wall formed by the friction pad after being attached to the clamping groove is smaller than the radius of the drive shaft.

3. A horizontal yaw base for a test bed according to claim 1, characterized in that: A self-locking mechanism is formed between the worm gear and the worm.

4. A horizontal yaw base for a test bed according to claim 1, characterized in that: The fixed base is provided with at least 4 threaded holes, and the movable base is provided with a corresponding arc-shaped elongated hole. The center of the arc-shaped elongated hole is on the axis of the vertical shaft. The threaded holes are threaded with bolts, which pass through the arc-shaped elongated hole and have their nuts pressing down on the movable base.

5. The horizontal oscillation base for a test bench according to claim 1, characterized in that: The adjustment mechanism can adjust the horizontal swing angle of the movable base within a range of ±3°.

6. A horizontal yaw base for a test bed according to claim 1, characterized in that: The large gear consists of only one section of arc-shaped teeth. The large gear is fixed to the tail end of the movable base by a pin, and the pin is interference-fitted with both the large gear and the movable base.

7. A horizontal yaw base for a test bed according to claim 1, characterized in that: A handwheel is fixed to one end of the drive shaft.

8. The horizontal oscillation base for a test bench according to claim 1, characterized in that: The mounting bracket is equipped with an angle sensor to detect the rotation angle of the movable base.

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