Carbon-free trolley driving shaft clutch and carbon-free trolley

Abstract

The invention discloses and provides a carbon-free trolley driving shaft clutch and a carbon-free trolley. The carbon-free trolley driving shaft clutch and the carbon-free trolley can avoid the slipping phenomenon in the starting stage and the sharp turn stage. The carbon-free trolley driving shaft clutch comprises a lead screw shaft and a lead screw nut, the lead screw shaft is further provided with a first flange bearing and a second flange bearing, the lead screw nut is located between the first flange bearing and the second flange bearing, the lead screw shaft is further sleeved with a spring, and the tail end of the spring abuts against a flange of the first flange bearing. The head end of the spring abuts against the tail end of the lead screw nut, and the head end of the lead screw nut abuts against a flange of the second flange bearing. The outer ring of the second flange bearing is coaxially and tightly sleeved with a driving gear, one side of the driving gear is fixedly provided with a clutch frame, and the clutch frame is provided with an axial sliding way which is in sliding fit with the head end of the lead screw nut all the time. The carbon-free trolley comprises a carbon-free trolley driving shaft clutch. The carbon-free trolley driving shaft clutch and the carbon-free trolley are applied to the technical field of carbon-free trolley driving shaft clutches.

Description

Technical Field

[0001] The invention relates to a clutch motion structure, in particular to a carbon-free trolley drive shaft clutch and a carbon-free trolley. Background Art

[0002] During the operation of the "Carbon-free Car", the slippage of the driving wheel will cause a slight virtual position in the cam that controls the steering. This virtual position will directly affect the subsequent driving route of the car, causing the driving trajectory to deviate. In mild cases, this deviation will cause the car to be unable to stably reach the set check-in point, and in more serious cases, it may cause the car to roll over, making the driving trajectory disordered and unstable, and even causing the car to run out of the competition venue. This situation increases the variables in the experiment, making the debugging process more complicated, but the debuggability is not strong, which faces greater challenges in the adjustment and optimization process.

[0003] For example, the Chinese patent with publication number CN216963537U discloses a carbon-free car, which is driven by a weight directly driving the active shaft. Since the competition requires purely mechanical steering, a cam is needed as a mechanical structure to control the steering direction of the car. The camshaft and the drive wheel shaft are connected by gears of the shaft system. There is a fixed transmission ratio and it cannot be reversed. Therefore, when the drive wheel is not firmly in contact with the ground, a certain degree of slippage will occur, causing the cam to move forward a certain angle, while the position of the car does not change, which will cause the subsequent trajectory to become disordered. This is particularly evident in the starting stage and sharp turns. Summary of the invention

[0004] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a carbon-free trolley drive shaft clutch and a carbon-free trolley which can avoid slipping during the starting stage and the sharp turning stage.

[0005] The technical solution adopted by the present invention is: the carbon-free trolley drive shaft clutch includes a screw shaft and a screw nut threadedly connected to the screw shaft, the screw shaft is also provided with a first flange bearing and a second flange bearing, the screw nut is located between the first flange bearing and the second flange bearing, the screw shaft is also sleeved with a spring, the tail end of the spring abuts against the flange of the first flange bearing, the head end of the spring abuts against the tail end of the screw nut, and the head end of the screw nut abuts against the flange of the second flange bearing; a driving gear is coaxially and tightly sleeved on the outer ring of the second flange bearing, a clutch frame is fixedly provided on one side of the driving gear, and a spring is provided on the clutch frame. There is an axial slideway which is always in sliding cooperation with the head end of the screw nut, and the sliding direction of the screw nut in the axial slideway is the same as the axial direction of the screw shaft; when the driving gear is subjected to the impact torque, the driving gear and the clutch frame rotate, and the clutch frame drives the screw nut to rotate on the screw shaft, and the tail end of the screw nut compresses the compression spring, and the head end of the screw nut moves axially in the axial slideway; when the spring is compressed to a certain extent, the screw nut and the screw shaft stop rotating relative to each other, and the driving gear drives the screw nut and the screw shaft to rotate as a whole through the clutch frame.

[0006] Furthermore, a support block is coaxially and tightly sleeved on the outer ring of the first flange bearing, and a connecting block is provided between the support block and the clutch frame.

[0007] Furthermore, a spring washer is provided between the head end of the spring and the tail end of the screw nut.

[0008] Furthermore, the screw shaft includes a screw, a left wheel drive shaft and a right wheel drive shaft, the left wheel drive shaft and the right wheel drive shaft are respectively arranged at the left and right ends of the screw, and the screw, the left wheel drive shaft and the right wheel drive shaft are coaxially arranged.

[0009] Furthermore, the screw rod, the left wheel drive shaft and the right wheel drive shaft are designed as one piece.

[0010] Furthermore, steps are provided at the connection between the screw rod and the right wheel drive shaft and at the connection between the screw rod and the left wheel drive shaft, and the first flange bearing and the second flange bearing are respectively provided on the steps at both ends of the screw rod.

[0011] Furthermore, the head end of the screw nut is a double-sided cut flange or a square flange.

[0012] Furthermore, the screw rod and the screw rod nut are ball screws.

[0013] Furthermore, the clutch frame has a screw mounting hole, a nut is arranged in the screw mounting hole, a mounting hole is arranged on the side of the driving gear, a screw threadedly connected to the nut is arranged on the mounting hole, and the driving gear is fixedly mounted on the clutch frame by the screw.

[0014] The carbon-free trolley includes a frame, a power drive mechanism, two drive wheels and a steering structure. The power drive mechanism and the steering structure are both arranged on the frame. The steering structure and the power drive mechanism are transmission connected. The carbon-free trolley includes the carbon-free trolley drive shaft clutch. The two ends of the screw shaft of the carbon-free trolley drive shaft clutch pass through the frame and are connected to the drive wheels. The drive gear of the carbon-free trolley drive shaft clutch is transmission connected to the power drive mechanism. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a three-dimensional diagram of the carbon-free trolley drive shaft clutch; Figure 2 It is a side view of the carbon-free trolley drive shaft clutch; Figure 3 It is a cross-sectional view of the carbon-free trolley drive shaft clutch; Figure 4 It is a partial exploded view of the carbon-free trolley drive shaft clutch; Figure 5 It is a three-dimensional diagram of the clutch frame; Figure 6 It is a three-dimensional picture of the carbon-free car; Figure 7 This is a stereoscopic image of the carbon-free car from another perspective. DETAILED DESCRIPTION

[0016] like Figures 1 to 5 As shown, in this embodiment, the carbon-free trolley drive shaft clutch includes a screw shaft 1 and a screw nut 2 threadedly connected to the screw shaft 1. In this embodiment, the screw shaft 1 includes a screw 12, a left wheel drive shaft 13 and a right wheel drive shaft 14. The left wheel drive shaft 13 and the right wheel drive shaft 14 are respectively arranged at the left and right ends of the screw 12, and the screw 12, the left wheel drive shaft 13 and the right wheel drive shaft 14 are coaxially arranged. In this embodiment, the screw 12, the left wheel drive shaft 13 and the right wheel drive shaft 14 are designed as a whole. In this embodiment, the screw 12 and the screw nut 2 are ball screws. The ball screw realizes motion conversion through the rolling of the ball. Compared with the sliding screw, its transmission efficiency is higher and the driving torque can be smaller. The production process of ball screws strictly controls temperature and humidity to ensure high precision. At the same time, through the pre-load design, the ball screw has high rigidity and can withstand large loads. The ball screw can achieve precise micro-feed and is suitable for applications that require high-precision positioning.

[0017] In this embodiment, the screw shaft 1 is also provided with a first flange bearing 3 and a second flange bearing 4, the screw nut 2 is located between the first flange bearing 3 and the second flange bearing 4, and a spring 5 is also sleeved on the screw shaft 1, the tail end of the spring 5 is against the flange of the first flange bearing 3, the head end of the spring 5 is against the tail end of the screw nut 2, and the head end of the screw nut 2 is against the flange of the second flange bearing 4; in this embodiment, a spring gasket 11 is provided between the head end of the spring 5 and the tail end of the screw nut 2, and the spring gasket plays a role in protecting the supporting surface in the connecting piece. When the flatness of the supporting surface of the connected piece is poor, it may become sensitive to biting caused by local contact, resulting in an increase in the friction coefficient. The presence of the gasket can stabilize this friction coefficient and prevent support surface problems caused by changes in the friction coefficient. The spring gasket gasket can also effectively reduce the risk of scratching the tail end surface of the screw nut 2 and further protect the supporting surface.

[0018] In this embodiment, a driving gear 6 is coaxially and tightly sleeved on the outer ring of the second flange bearing 4, and a clutch frame 7 is fixedly arranged on one side of the driving gear 6. The clutch frame 7 is provided with an axial slideway 8 that is always slidably matched with the head end of the screw nut 2, and the sliding direction of the screw nut 2 in the axial slideway 8 is the same as the axial direction of the screw shaft 1; when the driving gear 6 is subjected to the impact torque, the driving gear 6 and the clutch frame 7 rotate, and the clutch frame 7 drives the screw nut 2 to rotate on the screw shaft 1, and the tail end of the screw nut 2 compresses the compression spring 5, and the head end of the screw nut 2 moves axially in the axial slideway 8; when the spring 5 is compressed to a certain extent, the screw nut 2 and the screw shaft 1 stop rotating relative to each other, and the driving gear 6 drives the screw nut 2 and the screw shaft 1 to rotate as a whole through the clutch frame 7.

[0019] During the operation of the clutch, the compression of the spring will give a pair of elastic forces on both sides. The first flange bearing 3 and the second flange bearing 4 are blocked on both sides of the screw step. The position of the clutch frame, the driving gear and the screw is locked by the retaining edge, and there will be no axial displacement, ensuring the coaxiality of the entire structure without deflection. At this point, the spring is more stable and the output is smoother.

[0020] During the actual test, by selecting a ball screw with a lead of 2mm and a spring with a wire diameter of 0.9mm, the performance of the clutch can be optimized, successfully avoiding the above-mentioned problem of drive wheel slippage.

[0021] In this embodiment, a support block 9 is coaxially and tightly sleeved on the outer ring of the first flange bearing 3, and a connecting block 10 is provided between the supporting block 9 and the clutch frame 7. In this embodiment, the clutch frame 7, the connecting block 10 and the supporting block 9 are designed as an integrated whole, and the design of the connecting block 10 and the supporting block 9 makes the operation of the clutch frame 7 more stable.

[0022] In this embodiment, a step is provided at the connection between the screw rod 12 and the right wheel drive shaft 14 and at the connection between the screw rod 12 and the left wheel drive shaft 13. The step is a shaft shoulder, and the first flange bearing 3 and the second flange bearing 4 are respectively provided on the steps at both ends of the screw rod 12. A grinding wheel overtravel groove is provided at both shaft shoulders of the screw rod shaft to ensure that the flange surface is tightly fitted with the screw rod surface when the flange bearing is installed.

[0023] In this embodiment, the head end of the screw nut 2 is a double-sided cutting flange. The axial slideway 8 on the clutch frame 7 is adapted to the double-sided cutting flange, so that the screw nut 2 can only slide axially under the restriction of the slideway 8 and cannot rotate in the slideway 8.

[0024] In this embodiment, the clutch frame 7 is provided with a screw mounting hole 15, a nut 16 is arranged in the screw mounting hole 15, a mounting hole 17 is arranged on the side of the driving gear 6, a screw 18 threadedly connected with the nut 16 is arranged on the mounting hole 17, and the driving gear 6 is fixedly mounted on the clutch frame 7 by the screw 18. The design of the screw 18 on the outside and the nut 16 on the inside makes the installation of the driving gear 6 simpler and more convenient, and easy to maintain and adjust.

[0025] like Figure 6 to Figure 7As shown, in this embodiment, the carbon-free trolley includes a frame 19, a power drive mechanism 20, two drive wheels 21 and a steering structure 22, the power drive mechanism 20 and the steering structure 22 are both arranged on the frame 19, the steering structure 22 and the power drive mechanism 20 are transmission connected, the carbon-free trolley includes the carbon-free trolley drive shaft clutch a, the two ends of the screw shaft 1 of the carbon-free trolley drive shaft clutch a pass through the frame 19 and are connected to the drive wheels 21, and the drive gear 6 of the carbon-free trolley drive shaft clutch a is transmission connected to the power drive mechanism 20. At the start-up stage, since the static friction that the carbon-free car has to overcome is greater than the rolling friction during the movement, whether it is the potential energy of the instantaneous drop of the weight or the torque output by the motor, it will bring an acceleration to the car as a whole at this moment. The soft connection of the clutch allows the starting torque to drive the screw nut to rotate the compression spring through the driving clutch frame, and store the force as the elastic potential energy of the spring, avoiding the impact torque brought to the car by the hard connection between the output and the drive shaft, that is, starting slip. When the spring is compressed to a certain extent, it will spontaneously drive the car forward and convert the stored elastic potential energy into mechanical energy for the rotation of the drive wheel. Similarly, during the sharp turn of the car, the torque required by the drive wheel will be slightly smaller, and the clutch will also adaptively store energy in the spring to keep the driving torque of the car within an appropriate range.

[0026] Although the embodiments of the present invention are described with practical solutions, they do not constitute limitations on the meaning of the present invention. For those skilled in the art, it is obvious to modify the implementation scheme and combine it with other solutions based on this description.

Claims

1. Carbon-free trolley drive shaft clutch, characterized by: The carbon-free trolley drive shaft clutch comprises a screw shaft (1) and a screw nut (2) threadedly connected to the screw shaft (1); a first flange bearing (3) and a second flange bearing (4) are also provided on the screw shaft (1); the screw nut (2) is located between the first flange bearing (3) and the second flange bearing (4); a spring (5) is also sleeved on the screw shaft (1); the tail end of the spring (5) abuts against the flange of the first flange bearing (3); the head end of the spring (5) abuts against the tail end of the screw nut (2); and the head end of the screw nut (2) abuts against the flange of the second flange bearing (4); a driving gear (6) is coaxially and tightly sleeved on the outer ring of the second flange bearing (4); a clutch frame (7) is fixedly provided on one side of the driving gear (6); and a spring (5) is provided on the clutch frame (7) which is connected to the screw shaft. The head end of the nut (2) is always slidably matched with the axial slideway (8), and the sliding direction of the screw nut (2) in the axial slideway (8) is the same as the axial direction of the screw shaft (1); when the driving gear (6) is subjected to the impact torque, the driving gear (6) and the clutch frame (7) rotate, and the clutch frame (7) drives the screw nut (2) to rotate on the screw shaft (1), and the tail end of the screw nut (2) compresses the compression spring (5), and the head end of the screw nut (2) moves axially in the axial slideway (8); when the spring (5) is compressed to a certain extent, the screw nut (2) and the screw shaft (1) stop rotating relative to each other, and the driving gear (6) drives the screw nut (2) and the screw shaft (1) to rotate as a whole through the clutch frame (7).

2. The carbon-free trolley drive shaft clutch according to claim 1, characterized in that: A support block (9) is coaxially and tightly sleeved on the outer ring of the first flange bearing (3), and a connecting block (10) is provided between the support block (9) and the clutch frame (7).

3. The carbon-free trolley drive shaft clutch according to claim 1, characterized in that: A spring washer (11) is provided between the head end of the spring (5) and the tail end of the screw nut (2).

4. The carbon-free trolley drive shaft clutch according to claim 1, characterized in that: The screw shaft (1) comprises a screw (12), a left wheel drive shaft (13) and a right wheel drive shaft (14); the left wheel drive shaft (13) and the right wheel drive shaft (14) are respectively arranged at the left and right ends of the screw (12); the screw (12), the left wheel drive shaft (13) and the right wheel drive shaft (14) are coaxially arranged.

5. The carbon-free trolley drive shaft clutch according to claim 4, characterized in that: The screw rod (12), the left wheel drive shaft (13) and the right wheel drive shaft (14) are designed as one piece.

6. The carbon-free trolley drive shaft clutch according to claim 5, characterized in that: A step is provided at a connection between the screw rod (12) and the right wheel drive shaft (14) and a connection between the screw rod (12) and the left wheel drive shaft (13), and the first flange bearing (3) and the second flange bearing (4) are respectively provided on the steps at both ends of the screw rod (12).

7. The carbon-free trolley drive shaft clutch according to claim 1, characterized in that: The head end of the screw nut (2) is a double-sided cut flange or a square flange.

8. The carbon-free trolley drive shaft clutch according to claim 4, characterized in that: The screw rod (12) and the screw rod nut (2) are ball screw rods.

9. The carbon-free trolley drive shaft clutch according to claim 1, characterized in that: The clutch frame (7) has a screw mounting hole (15), a nut (16) is arranged in the screw mounting hole (15), a mounting hole (17) is arranged on the side of the driving gear (6), a screw (18) threadedly connected to the nut (16) is arranged on the mounting hole (17), and the driving gear (6) is fixedly mounted on the clutch frame (7) by the screw (18).

10. A carbon-free vehicle, comprising a vehicle frame (19), a power drive mechanism (20), two drive wheels (21) and a steering structure (22), wherein the power drive mechanism (20) and the steering structure (22) are both arranged on the vehicle frame (19), and the steering structure (22) is transmission-connected to the power drive mechanism (20), characterized in that: The carbon-free trolley comprises a carbon-free trolley drive shaft clutch (a) as described in any one of claims 1 to 9, wherein both ends of the screw shaft (1) of the carbon-free trolley drive shaft clutch (a) pass through the frame (19) and are connected to the drive wheel (21), and the drive gear (6) of the carbon-free trolley drive shaft clutch (a) is transmission-connected to the power drive mechanism (20).

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