Electric cylinder special for truck head lifting

Abstract

This invention relates to a specialized electric cylinder for lifting truck cabs, belonging to the field of mechanical engineering. The purpose of this invention is to provide a specialized electric cylinder for lifting truck cabs by improving the structure of the electric cylinder. The invention includes a ball screw, a servo motor with a brake function, and a planetary reducer. A hollow piston rod, a retractable protective net, a spherical roller bearing, a lock nut, and a base are sequentially mounted on the outside of the ball screw nut. The tail end shaft of the ball screw and the output shaft of the planetary reducer are respectively connected to the base and fitted with meshing driven and driving gears. This invention is energy-saving and environmentally friendly, has low maintenance costs, fast response speed, strong environmental adaptability, and relatively high safety.

Description

Technical Field

[0001] This utility model belongs to the field of mechanical engineering, and in particular relates to linear actuators and transmission devices. Background Technology

[0002] Electric cylinders are precision devices that convert the rotary motion of an electric motor into linear motion, and their applications are quite widespread. However, due to the structural characteristics of existing electric cylinders, there are also some drawbacks, and technicians have been making various improvements to address these shortcomings based on their respective application environments. Currently, most truck cabs use hydraulic lifting cylinders, but compared to hydraulic cylinders, electric cylinders offer superior performance, and their cleaning and maintenance costs are relatively lower. Summary of the Invention

[0003] The purpose of this invention is to provide a dedicated electric cylinder for lifting truck cabs by improving the structure of the electric cylinder.

[0004] This utility model includes a ball screw, a servo motor with braking function, and a planetary reducer. The top of the screw is connected to the inner wall of a hollow piston rod via a single-row angular contact ball bearing, which is then secured by a flange locking nut. The bottom of the hollow piston rod is mounted on the top of the ball screw nut, which is also mounted on the top of a retractable protective net. The bottom of the retractable protective net is mounted on the top of a spherical roller bearing base. The lower end of the spherical roller bearing is locked by a locking nut, which is mounted on one end of the ball screw on the base. A driven gear is mounted on the shaft passing through the base at the bottom of the screw, and a cylindrical roller bearing is mounted between the tail end of the screw and the rear cover. The cylindrical roller bearing is secured by a shaft elastic washer and a retaining ring. The driven gear meshes with the driving gear. The planetary reducer is mounted on the base, and the output shaft of the planetary reducer is mounted on the driving gear via flange bolts. A rear cover is fastened to the outside of the driving gear and the driven gear.

[0005] This utility model applies an electromechanical cylinder to the lifting operation of the cab of a heavy-duty vehicle. Since the electromechanical lifting cylinder uses mechanical transmission, it is relatively convenient to maintain and use. Moreover, the operating environment for maintenance is not as strict as that for hydraulic lifting cylinders. Therefore, ordinary personnel can easily master it. As a result, this utility model is energy-saving and environmentally friendly, has low maintenance costs, fast response speed, strong environmental adaptability, and relatively high safety. Attached Figure Description

[0006] Figure 1 This is an axial sectional view of the overall structure of this utility model; Figure 2 This is a utility model Figure 1 Enlarged view of part A; Figure 3 This is a utility model Figure 1Enlarged view of part B; Figure 4 This is an exploded view of the bottom of this utility model; Figure 5 This is a schematic diagram of the overall design of this utility model. Detailed Implementation

[0007] This utility model includes a ball screw, a servo motor 3 with a braking function, and a planetary reducer 17. Existing ball screws include a screw 1 and a ball screw nut 6; the servo motor 3 with a braking function is the power source of this utility model; the planetary reducer 17 is an intermediate mechanism that transmits power to the drive gear of this utility model, and its power comes from the servo motor 3 with a braking function.

[0008] In this invention, the top end of the lead screw 1 is connected to the inner wall of the hollow piston rod 2 via a single-row angular contact ball bearing 5, and then the single-row angular contact ball bearing 5 is secured by a flange locking nut 4. See Figure 2 The single-row angular contact ball bearing 5 and hollow piston rod 2 are mounted at the top of the lead screw 1 to ensure the stability of the top of the lead screw 1 during rotation. The flange locking nut 4 is a component that secures the single-row angular contact ball bearing 5. It can be installed on the lead screw 1 by thread matching. When it reaches the lowest point, it can firmly fasten the inner shell of the single-row angular contact ball bearing 5 to the top of the lead screw 1. When the hollow piston rod 2 rises or falls, it slides and rubs against the outer wall of the outer shell of the single-row angular contact ball bearing 5.

[0009] The bottom end of the hollow piston rod 2 of this utility model is installed on the top end of the ball screw nut 6, the bottom end of the ball screw nut 6 is installed on the top end of the retractable protective net 7, the bottom end of the retractable protective net 7 is installed on the top end of the spherical roller bearing 8 base, and the lower end of the spherical roller bearing 8 is locked by a locking nut 16, which is installed on one end of the ball screw of the base 9.

[0010] See Figure 3 A hollow piston rod 2 is fitted onto the upper end of the ball screw nut 6 outside the lead screw 1. A retractable protective net 7, a spherical roller bearing 8, a locking nut 16, and a base 9 are sequentially fitted onto the lower end of the ball screw nut 6 outside the lead screw 1. The spherical roller bearing 8 and the locking nut 16 are covered by the side wall of the base 9, and each connection is sealed to prevent dust from entering the hollow piston rod 2. During lifting or lowering, the ball screw nut 6, while rising or falling along the lead screw 1, pushes the hollow piston rod 2 to rise or fall as well. At this time, the ball screw nut 6 pulls the upper end of the retractable protective net 7 to rise or fall along with it. Since the retractable protective net 7 is similar to a bellows, only the upper end of the retractable protective net 7 rises or falls with the hollow piston rod 2, while the folds of the retractable protective net 7 expand or compress, and its bottom end does not move, thus maintaining the protection of the lead screw 1 by the retractable protective net 7 in this section.

[0011] from Figure 3 As can be seen, the rod wall of the lead screw 1 corresponding to the mounting of the spherical roller bearing 8 and below does not have ball guide grooves. This facilitates the fastening of the bearing and gear to the bottom of the lead screw 1. The lock nut 16 is the fastening component for the spherical roller bearing 8. The lock nut 16 securely tightens the bearing, preventing slippage. For ease of installation, see... Figure 3 An annular groove is provided on the base 9 corresponding to the locking nut 16, so that the locking nut 16 is placed in this groove without contacting the base 9. In addition, the side wall of the base 9 continues to extend upward, covering the spherical roller bearing 8 between the inner side wall of the base 9 and the lead screw 1.

[0012] A driven gear 10 is mounted on the shaft passing through the base 9 at the bottom end of the lead screw 1, and a cylindrical roller bearing 12 is mounted between the tail end of the lead screw 1 and the rear cover 14; the cylindrical roller bearing 12 is fastened by a shaft elastic washer and a retaining ring 11, the driven gear 10 meshes with the driving gear 15, the planetary reducer 17 is mounted on the base 9, and the output shaft of the planetary reducer 17 is mounted on the driving gear 15 by flange bolts 13; the rear cover 14 is fastened to the outside of the driving gear 15 and the driven gear 10.

[0013] See Figure 4 The base 9 is a fixed seat for mounting two sets of components side by side: one is the cylinder part, and the other is the power part. As can be seen from the figure, the tail shaft of the lead screw 1 and the output shaft of the planetary reducer 17 extend side by side from the base 9, and are respectively equipped with a driven gear 10 and a driving gear 15 that mesh with each other. In this way, the planetary reducer 17 transmits power to the lead screw 1 through the driving gear 15 and the driven gear 10.

[0014] This utility model employs three bearings (single-row angular contact ball bearing 5, spherical roller bearing 8, and cylindrical roller bearing 12). The single-row angular contact ball bearing 5 and spherical roller bearing 8 are installed between the lead screw 1 and the hollow piston rod 2, while the cylindrical roller bearing 12 is installed between the lead screw 1 and the rear cover 14. Therefore, when the lead screw 1 rotates, it is similar to stationary rotation. First, the ball screw nut 6 can only be driven to rise or fall with the hollow piston rod 2 through the cooperation of the balls on the lead screw 1 and the ball raceway. When the lead screw 1 rotates, the hollow piston rod 2 and the rear cover 14 will not rotate with it.

[0015] The pin 18 at the lower end of the ball screw nut 6 of this utility model is inserted into the base 9. A limiting hole is provided on the base 9 at the position corresponding to the pin 18. Regardless of whether the ball screw nut 6 is in the rising or falling state, the pin 18 always remains in this hole. On the one hand, it serves as a guide, and on the other hand, it prevents the ball screw nut 6 from moving with the screw 1 when it rotates. In this way, it can only ensure that the ball screw nut 6 can move in a straight line up and down.

[0016] See Figure 5 In this utility model, an upper U-clamp C is fixedly installed at the top of the hollow piston rod 2 (installed at the position corresponding to the bottom of the cab), and a lower U-clamp D is installed at the bottom of the rear cover 14 at the same axis position as the upper U-clamp C (installed at the position corresponding to the vehicle body). These two U-clamps are present in existing hydraulic cylinders, air cylinders, etc., so they will not be described in detail here.

Claims

1. A special electric cylinder for lifting truck cab, comprising a ball screw, a servo motor (3) with braking function, and a planetary reducer (17), characterized in that: The top of the lead screw (1) is connected to the inner wall of the hollow piston rod (2) via a single-row angular contact ball bearing (5), and then the single-row angular contact ball bearing (5) is fastened by a flange locking nut (4); the bottom end of the hollow piston rod (2) is installed on the top of the ball screw nut (6), the bottom end of the ball screw nut (6) is installed on the top of the retractable protective net (7), the bottom end of the retractable protective net (7) is installed on the top of the spherical roller bearing (8), the lower end of the spherical roller bearing (8) is locked by a locking nut (16), and the locking nut (16) is installed on one end of the ball screw of the base (9); the lead screw (1) A driven gear (10) is installed on the shaft that passes through the base (9) at the bottom end, and a cylindrical roller bearing (12) is installed between the tail end of the lead screw (1) and the rear cover (14); the cylindrical roller bearing (12) is fastened by a shaft elastic washer and a retaining ring (11), the driven gear (10) meshes with the driving gear (15), the planetary reducer (17) is installed on the base (9), and the output shaft of the planetary reducer (17) is installed on the driving gear (15) by a flange bolt (13); the rear cover (14) is fastened to the outside of the driving gear (15) and the driven gear (10).

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