Electric lifting cylinder capable of realizing abnormally-moving function

Abstract

The invention discloses an electric lifting cylinder capable of achieving a abnormally-moving function, and belongs to the technical field of mechanical design and manufacturing. According to the electric lifting cylinder capable of achieving the abnormally-moving function, the electric lifting cylinder is adopted for lifting a cab of a heavy-load vehicle type. The device comprises a rod end, a cylinder barrel, a direct current motor with a brake, a planetary reducer and a U-shaped clamp, the U-shaped clamp is fixedly installed on a gear box, the gear box is installed on a base, the base is buckled below the planetary reducer and a bearing base, and a driving gear, a center gear and a driven gear are all arranged in the gear box. According to the invention, the electric mechanical cylinder is applied to the lifting work of the cab of a heavy-duty vehicle, and the electric mechanical lifting cylinder is completed by adopting mechanical transmission, so that the maintenance and the use are relatively convenient, and the maintenance operation environment is not strict compared with that of a hydraulic lifting cylinder, so that ordinary personnel can easily master the operation skillfully, and the working efficiency is greatly improved. Therefore, the system is energy-saving, environment-friendly, low in maintenance cost, high in response speed, high in environmental adaptability and relatively high in safety.

Description

Technical Field

[0001] The present invention belongs to the technical field of mechanical design and manufacturing, and particularly relates to a working device for special vehicles in lifting and hoisting devices. Background Art

[0002] Lifting cylinders are working devices widely used in industrial production processes, generally divided into hydraulic lifting cylinders, mechanical lifting cylinders, electric lifting cylinders, etc. Due to the advantages of hydraulic lifting cylinders, they are widely used in existing industrial production and other activities, generally 3 - 5 times that of mechanical lifting cylinders. Mechanical lifting cylinders can generally only be applied in some specific scenarios, with significant growth in the light industry, electronics, and emerging automation fields, but the overall market share is still lower than that of hydraulic lifting cylinders. Existing automotive cab lifts are divided into heavy-duty models (1.5 - 3 ton trucks, engineering vehicles, etc.) and light-duty models (0.8 - 1.5 ton urban logistics vehicles, light trucks, etc.). For heavy-duty cab lifts, hydraulic lifting cylinders are basically used, and for light-duty cab lifts, electric lifting cylinders are used. Electric mechanical lifting cylinders are not used for heavy-duty cab lifts. Summary of the Invention

[0003] The object of the present invention is an electric lifting cylinder that can achieve power-off braking function for lifting the cab of heavy-duty vehicle models using an electric lifting cylinder.

[0004] The present invention includes a rod end, a cylinder barrel, a DC motor with a brake, a planetary reducer, a U-shaped clamp. The U-shaped clamp is fixedly installed on the gear box, the gear box is installed on the base, and the base is buckled under the planetary reducer and the bearing base; the output shaft of the planetary reducer passes through the end of the base and is installed with a driving gear, the driving gear meshes with the central gear, the central gear is installed through a stud-type roller bearing and a thrust bearing, the top of the stud-type roller bearing is installed on the base, the central gear meshes with the driven gear, the driven gear is installed at the bottom end of the planetary roller screw, and the driving gear, the central gear, and the driven gear are all placed inside the gear box; the planetary roller screw is installed in the bearing base through a double-row angular contact ball bearing, and the bearing base is fixedly installed on the cylinder barrel; a flange-type single nut with a matching thread is sleeved on the planetary roller screw, the flange-type single nut is fixedly installed on the nut base, the bottom end of the hollow piston rod is fixed on the nut base, the base of the rod end is installed on the top end of the hollow piston rod through a thread and is fastened laterally through a threaded pin; a deep groove ball bearing is installed at the top end of the planetary roller screw, and the outer shell of the deep groove ball bearing contacts the inner wall of the hollow piston rod; a sealing guide sleeve is installed between the inner wall of the top end of the cylinder barrel and the outer wall of the hollow piston rod.

[0005] The present invention applies an electro-mechanical cylinder to the cab lifting work of heavy-duty vehicles. Since the electro-mechanical lifting cylinder uses mechanical transmission to complete the work, it is relatively convenient for maintenance and use, and the maintenance operation environment is not as strict as that of a hydraulic lifting cylinder. Therefore, ordinary personnel can easily master it proficiently. Thus, the present invention features energy conservation and environmental protection, low maintenance costs, relatively fast response speed, strong environmental adaptability, and relatively high safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0006] Figure 1 is an external schematic diagram of the overall structure of the present invention; Figure 2 is a sectional view of the mechanism at one end of the U-shaped clamp of the present invention; Figure 3 is a sectional view of the structure at one end of the rod end of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0007] See Figure 1 , the present invention includes a rod end 1, a cylinder barrel 3, a brake DC motor 4, a planetary gearbox 5, a U-shaped clamp 6, etc. The rod end 1 and the U-shaped clamp 6 are the normal connection parts installed at the bottom end of the cab and on the vehicle frame, and their working principles are the same as those of the rod end 1 and the U-shaped clamp 6 of the existing hydraulic lifting cylinder. A brake DC motor is a DC drive motor integrated with an electromagnetic or mechanical braking device, which can quickly lock the rotor position when power is cut off or the power supply stops, preventing the load from moving due to inertia or gravity. Due to its outstanding performance in terms of safety, control accuracy, and energy efficiency, this type of motor is applied in the present invention. A planetary gearbox is a high-precision and high-torque-density power transmission device that realizes speed reduction and torque increase through the multi-tooth meshing structure of the planetary gear set. Its core design consists of a sun gear, planetary gears, an internal gear ring, and a planetary carrier, and it is widely used in scenarios that require a compact structure, high load-bearing capacity, and precise transmission.

[0008] The improvement of the present invention is mainly in the mechanical transmission parts near the two ends of the rod end 1 and the U-shaped clamp 6 and the transmission part inside the cylinder body of the electro-mechanical lifting cylinder.

[0009] In the present invention, the U-shaped clamp 6 is fixedly installed on the gear box 21, the gear box 21 is installed on the base 13, and the base 13 is buckled under the planetary gearbox 5 and the bearing base 16; the output shaft 7 of the planetary gearbox 5 is installed with a driving gear 8 at the end passing through the base 13, the driving gear 8 meshes with the central gear 9, the central gear 9 is installed through a stud type roller bearing 10 and a thrust bearing 11, the top of the stud type roller bearing 10 is installed on the base 13, the central gear 9 meshes with the driven gear 12, the driven gear 12 is installed at the bottom end of the planetary roller screw 14, and the driving gear 8, the central gear 9, and the driven gear 12 are all placed inside the gear box 21.

[0010] SeeFigure 2 , the gear box 21 of the present invention is a sealed box body. The meshing transmission between the driving gear 8, the central gear 9 and the driven gear 12 is all completed inside the gear box 21. Through this meshing transmission, the power of the brake DC motor 4 and the planetary reducer 5 is transmitted to the planetary roller screw 14 through the gear set. Among them, the driven gear 12 is radially installed on the stud type roller bearing 10 through the thrust bearing 11, and the stud type roller bearing 10 radially installs the driven gear 12 inside the gear box 21 to ensure that it can only rotate inside the gear box 21 and will not have radial movement.

[0011] The base 13 is a connecting component that facilitates the installation of the planetary reducer 5, the gear box 21 and the bearing base 16 together. See Figure 2 , one side is fixedly installed with the gear box 21 through threads, and the other end is slot-connected according to the shapes of the bottoms of the planetary reducer 5 and the bearing base 16 (similar to wedge insertion and installed with interference fit).

[0012] The planetary roller screw 14 is installed inside the bearing base 16 through a double-row angular contact ball bearing 15, and the bearing base 16 is fixedly installed on the cylinder barrel 3.

[0013] See Figure 2 , the double-row angular contact ball bearing 15 and the bearing base 16 form a stable mechanism, which can not only ensure the stability of the planetary roller screw 14 but also ensure the rotation of the planetary roller screw 14. This section of the planetary roller screw 14 has no threads.

[0014] A flange single nut 17 with a matching thread is sleeved on the planetary roller screw 14. The flange single nut 17 is fixedly installed on the nut base 18, and the bottom end of the hollow piston rod 2 is fixedly installed on the nut base 18.

[0015] See Figure 2 , the flange single nut 17 and the nut base 18 are an integrated transfer mechanism. When the planetary roller screw 14 rotates, it will move the transfer mechanism up and down (radially) along the planetary roller screw 14, thereby completing the lifting or lowering of the transfer mechanism. Since the bottom of the hollow piston rod 2 is fixedly installed on the nut base 18, when the transfer mechanism rises or falls, the hollow piston rod 2 will also rise or fall synchronously.

[0016] The descriptions from paragraph

[0009] to paragraph

[0015] above are for the improvement of the internal connection mechanism (or transmission mechanism, etc.) at one end of the U-shaped clamp 6 of the present invention.

[0017] The base of the rod end 1 is installed at the top end of the hollow piston rod 2 by means of threads and is fastened transversely by a threaded pin 22. The top end of the planetary roller screw 14 is installed with a deep groove ball bearing 20, and the outer shell of the deep groove ball bearing 20 contacts the inner wall of the hollow piston rod 2; a seal guide sleeve 19 is installed between the inner wall of the top end of the cylinder barrel 3 and the outer wall of the hollow piston rod 2.

[0018] See Figure 3 , this part is an improvement of the present invention for the connection mechanism (or transmission mechanism, etc.) at one end of the rod end 1. The bottom of the rod end 1 of the present invention is screwed onto the hollow piston rod 2 in a thread matching form, and then is fixed by a threaded pin 22 from the side of the hollow piston rod 2. This threaded pin 22 prevents the thread from becoming loose due to the vibration generated during the movement of the vehicle, and can also assist in increasing the stability of the installation of the rod end 1 on the hollow piston rod 2. The seal guide sleeve 19 is similar to a support plug, which is placed between the outer wall of the hollow piston rod 2 and the inner wall of the cylinder barrel 3, and the hollow piston rod 2 slides frictionally with it. The present invention provides a deep groove ball bearing 20 between the hollow piston rod 2 and the planetary roller screw 14, and applies the characteristics of the radial load and axial load of the deep groove ball bearing 20, that is, it can ensure the radial telescopic movement of the hollow piston rod 2 relative to the planetary roller screw 14, and can also ensure that when the planetary roller screw 14 performs axial movement (rotation), it will not drive the hollow piston rod 2 to rotate accordingly.

[0019] Mechanical lifting cylinders are generally widely used in existing factory processing machinery. Due to the special reasons for lifting the cab of a vehicle, existing vehicle lifting cylinders all use hydraulic lifting cylinders and do not use mechanical lifting cylinders. However, due to some advantages of mechanical lifting cylinders compared with hydraulic lifting cylinders, the present invention improves the mechanical lifting cylinder to adapt to the lifting work of the vehicle cab.

[0020] Damping function: In the normal lifting state of the vehicle head, the motor outputs torque through the reduction gear, and the planetary screw converts the torsional force into a linear motion. When it is necessary to stop at a certain position, as long as the torque output is stopped and the braking device is started, it can stop.

[0021] However, the damping function occurs during the driving of the vehicle. Because of the bumpy road, the cab will move vertically relative to the ground, and the lifting cylinder as the installation point of the cab will also change its damping with the bumps, with the assembled length extending and shortening to achieve the damping comfort of the whole vehicle driving state. Generally, the damping amplitude is ±50 mm, and the damping force is about 200 N - 500 N.

[0022] The inherent structure of the electric cylinder perfectly solves the design difficulty of the damping force. When the planetary screw is under the action of gravity, the screw nut will move downward accordingly, and the screw converts the linear motion into a rotational motion. Because the output shaft of the DC motor can rotate freely, the whole damping system becomes the conversion of linear motion into torsional force, thus realizing the damping function.

[0023] To achieve the electric adjustment function, a control box can be added. The control box can detect the damping force and stroke during the shock through an electronic integrated circuit. Subsequently, the inventors of the present invention will research on embedding an AI electronic chip to realize the intelligentization of the shock function and thus achieve the best comfortable driving experience. The lifting driving force is the motor torque, and the shock driving force is the gravity of the vehicle head and the inertial force of the up and down movement of the vehicle head.

Claims

1. An electric lifting cylinder capable of realizing a funerary movement function, comprising a rod end (1), a cylinder barrel (3), a DC motor with a brake (4), a planetary speed reducer (5), and a U-shaped clamp (6), characterized in that: The U-shaped clamp (6) is fixedly installed on the gear box (21), the gear box (21) is installed on the base (13), and the base (13) is buckled under the planetary reducer (5) and the bearing base (16); the output shaft (7) of the planetary reducer (5) is installed with a driving gear (8) through the end of the base (13), the driving gear (8) meshes with the central gear (9), the central gear (9) is installed through a stud type roller bearing (10) and a thrust bearing (11), the top of the stud type roller bearing (10) is installed on the base (13), the central gear (9) meshes with the driven gear (12), the driven gear (12) is installed at the bottom end of the planetary roller screw (14), and the driving gear (8), the central gear (9) and the driven gear (12) are all placed in the gear box (21); the planetary roller screw (14) is installed in the bearing base (16) through a double-row angular contact ball bearing (15), and the bearing base (16) is fixedly installed on the cylinder barrel (3); a flange type single nut (17) with a matching thread is sleeved on the planetary roller screw (14), the flange type single nut (17) is fixedly installed on the nut base (18), the bottom end of the hollow piston rod (2) is fixed on the nut base (18), the base of the rod end (1) is installed on the top end of the hollow piston rod (2) through a thread and is transversely fastened by a threaded pin (22), a deep groove ball bearing (20) is installed at the top end of the planetary roller screw (14), and the outer shell of the deep groove ball bearing (20) contacts the inner wall of the hollow piston rod (2); a seal guide sleeve (19) is installed between the inner wall of the top end of the cylinder barrel (3) and the outer wall of the hollow piston rod (2).

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